FCC ID: 2AC23-DT3A WIFI+BT Module

Hui Zhou Gaoshengda Technology Co., LTD DT3AR1501 WIFI+BT Module IEEE 802.11 a/b/g/n 1T/1R Model Number: DT3AR1501 Product Descrition The DT3AR1501 is a complete 2.4GHz/5GHz WIFI 11 SISO module. This module provides a high level of integration with a dual-stream IEEE 802.11n MAC/ base band /radio and Bluetooth 5.2.The WLAN operation supports 20MHz,40MHz channels for data rates up to 150Mbps. It fully complies with IEEE 802.11 a/b/g/n feature rich wireless connectivity at high standards,delivers reliable,cost-effective, throughput from an extended distance. Product Features Complies with IEEE 802.11b/g/n for 2.4GHzIEEE 802.11a/n for 5GHz Bluetooth v5.2 One transmit and one receive path(1T1R) Works with all existing network nfrastructure. Capable of up to 128-Bit WEP Encryption. Freedom to roam while staying connected. UP to 150Mbps High-Speed Transfer Rate in 802.11n mode of operation. Operating SystemsLinux, Windows. Low power consumption. Easy to install and configure. High speed usd 2.0 interface. ROHS compliant Product Specification Model DT3AR1501 Product Name WIF+BT Module Standard Interface 802.11 a/b/g/n USB Data Transfer Rate MAX 150Mbps Modulation Method GFSK,/4-DQPSK,8DPSK(bluetooth) DQPSK,DBPSK,CCK(802.11b) QPSK,BPSK,16QAM,64QAM with OFDM (802.11g) QPSK,BPSK,16QAM,64QAM with OFDM (802.11n) QPSK,BPSK,16QAM,64QAM with OFDM (802.11a) Frequency Band BLUETOOTH 2402~2480 MHz Operation Mode WIFI 2.4G: 2412~2462 MHz 5G: 5150~5350MHz, 5470~5725MHz5725~5850MHz Infrastructure Security WEP, TKIP, AES, WPA, WPA2 Operating Voltage 3.3V10%

Current Consumption 1000mA Antenna Type PCB Operating Temperature 0 ~ 70C ambient temperature Storage Temperature

-40 ~ 80C ambient temperature Humidity 5 to 95 % maximum (non-condensing) PAGE 1 OF 6 Version 1.0 Hui Zhou Gaoshengda Technology Co., LTD DT3AR1501 NOTICE:

please keep this product and accessories attached to the places which children can't touch;

do not splash water or other liquid onto this product, otherwise it may cause damage;

do not put this product near the heat source or direct sunlight, otherwise it may cause deformation or malfunction;

please keep this product away from flammable or naked flame;

please do not repair this product by yourself. Only qualified personnel can be repaired. FCC Statement This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

-Reorient or relocate the receiving antenna.

-Increase the separation between the equipment and receiver.

-Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

-Consult the dealer or an experienced radio/TV technician for help. This equipment complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

(1) This device may not cause harmful interference, and

(2) This device must accept any interference received, including interference that may cause undesired operation. Any changes or modifications not expressly approved by the party responsible for compliance could void the users authority to operate the equipment. 2.2 This module has been assessed against the following FCC rule parts: CFR 47 FCC Part 15 C (15.247, DTS and DSS) and CFR 47 FCC Part 15 E (NII). It is applicable to the modular transmitter 2.3 This radio transmitter 2AC23-DT3A has been approved by Federal Communications Commission to operate with the antenna types listed below, with the maximum permissible gain indicated. Antenna types not included in this list that have a gain greater than the maximum gain indicated for any type listed are strictly prohibited for use with this device. The concrete contents to check are the following three points.

) Must use a PCB antenna with gain not exceeding those shown in the table below.

) Should be installed so that the end user cannot modify the antenna

) Feed line should be designed in 50ohm Fine-tuning of return loss etc. can be performed using a matching network. The antenna shall not be accessible for modification or change by the end user. 2.4 The module complies with FCC Part 15.247 / Part 15.407 and apply for Single module approval. 2.5 Trace antenna designs: Not applicable the antenna is integrated into the module and cannot be modified. The device must be professionally installed The intended use is generally not for the general public. It is generally for industry/commercial use. The connector is within the transmitter enclosure and can only be accessed by disassembly of the transmitter which is not normally required. the user has no access to the connector. Installation must be controlled. Installation requires special training PAGE 2 OF 6 Version 1.0 Hui Zhou Gaoshengda Technology Co., LTD DT3AR1501 2.6 This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with a minimum distance of 20cm between the radiator & your body. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. 2.7 Antenna type and antenna gain:

2.4G WIFI&5G WIFI Antennas:

Antenna Frequency (MHz) Antenna Type MAX Antenna Gain (dBi) 1 2 2412-2462 2412-2462 PCB Antenna PCB Antenna 0.34 1.59 Antenna No. Frequency Band 1 2 5150-5850 5150-5850 Antenna Type PCB Antenna PCB Antenna Max Antenna Gain (dBi) 2.42 3.29 BT/BLE Antenna:

Antenna 1 Frequency (MHz) Antenna Type MAX Antenna Gain (dBi) 2402-2480 PCB Antenna

-4.01 2.8 Please notice that if the FCC identification number is not visible when the module is installed inside another device, then the outside of the device into which the module is installed must also display a label referring to the enclosed module. This exterior label can use wording such as Contains FCC ID: 2AC23-DT3A; any similar wording that expresses the same meaning may be used. 2.9 Testing of the host product with all the transmitters installed referred to as the composite investigation test- is recommended, to verify that the host product meets all the applicable FCC rules. The radio spectrum is to be investigated with all the transmitters in the final host product functioning to determine that no emissions exceed the highest limit permitted for any one individual transmitter as required by Section 2.947(f). The host manufacturer is responsible to ensure that when their product operates as intended it does not have any emissions present that are out of compliance that were not present when the transmitters were tested individually. If the modular transmitter has been fully tested by the module grantee on the required number of channels, modulation types, and modes, it should not be necessary for the host installer to re-test all the available transmitter modes or settings. It is recommended that the host product manufacturer, installing the modular transmitter, perform some investigative measurements to confirm that the resulting composite system does not exceed the spurious emissions limits or band edge limits (e.g., where a different antenna may be causing additional emissions). The testing should check for emissions that may occur due to the intermixing of emissions with the other transmitters, digital circuitry, or due to physical properties of the host product (enclosure). This investigation is especially important when integrating multiple modular transmitters where the certification is based on testing each of them in a stand-alone configuration. 2.10 Any company of the host device which install this modular should perform the test of radiated & condicted emission and spurious emission etc. according to FCC Part 15C: 15.247 and 15.209 & 15.207, part 15 E 15.407,15B class B requirement, only if the test result comply with FCC part 15C: 15.247 and 15.209 & 15.207, part 15 E 15.407,15B class B requirement. Then the host can be sold legally. PAGE 3 OF 6 Version 1.0 Hui Zhou Gaoshengda Technology Co., LTD DT3AR1501 The host product manufacturer is responsible for compliance to any other FCC rules that apply to the host not covered by the modular transmitter grant of certification. If the grantee markets their product as being Part 15 Subpart B compliant

(when it also contains unintentional-radiator digital circuity), then the grantee shall provide a notice stating that the final host product still requires Part 15 Subpart B compliance testing with the modular transmitter installed. The host manufacture is recommended to use D04 Module Integration Guide recommending as "best practice" RF design engineering testing and evaluation in case non-linear interactions generate additional non-compliant limits due to module placement to host components or properties. 2.11 2.12 This module is stand-alone modular. If the end product will involve the Multiple simultaneously transmitting condition or different operational conditions for a stand-alone modular transmitter in a host, host manufacturer have to consult with module manufacturer for the installation method in end system. Canada Statement This device complies with Industry Canadas license-exempt RSSs. Operation is subject to the following two conditions:

(1) This device may not cause interference; and

(2) This device must accept any interference, including interference that may cause undesired operation of the device. Le prsent appareil est conforme aux CNR dIndustrie Canada applicables aux appareils radio exempts de licence. Lexploitation est autorise aux deux conditions suivantes :

(1) lappareil ne doit pas produire de brouillage;

(2) lutilisateur de lappareil doit accepter tout brouillage radiolectrique subi, mme si le brouillage est susceptible den compromettre le fonctionnement. Please notice that if the ISED certification number is not visible when the module is installed inside another device, then the outside of the device into which the module is installed must also display a label referring to the enclosed module. This exterior label can use wording such as the following: Contains IC: 12290A-DT3A any similar wording that expresses the same meaning may be used. l'appareil hte doit porter une tiquette donnant le numro de certification du module d'Industrie Canada, prcd des mots Contient un module d'mission , du mot IC: 12290A-DT3A ou d'une formulation similaire exprimant le mme sens, comme suit The device for operation in the band 5150-5250 MHz is only for indoor use to reduce the potential for harmful interference to co-channel mobile satellite systems for devices with detachable antenna(s), the maximum antenna gain permitted for devices in the band 5725-5850 MHz shall be such that the equipment still complies with the e.i.r.p. limits as appropriate;

Les dispositifs fonctionnant dans la bande 5150-5250 MHz sont rservs uniquement pour une utilisation lintrieur afin de rduire les risques de brouillage prjudiciable aux systmes de satellites mobiles utilisant les mmes canaux;

pour les dispositifs munis d'antennes amovibles, le gain maximal d'antenne permis (pour les dispositifs utilisant la bande de 5 725 5 850 MHz) doit tre conforme la limite de la p.i.r.e. spcifie, selon le cas;

The device meets the exemption from the routine evaluation limits in section 2.5 of RSS 102 and compliance with RSS-102 RF exposure, users can obtain Canadian information on RF exposure and compliance. Le dispositif rencontre l'exemption des limites courantes d'valuation dans la section 2.5 de RSS 102 etla conformit l'exposition de RSS-102 RF, utilisateurs peut obtenir l'information canadienne surl'exposition et la conformit de rf. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. This equipment should be installed and operated with a minimum distance of 20 centimeters between the radiator and your body. PAGE 4 OF 6 Version 1.0 Hui Zhou Gaoshengda Technology Co., LTD DT3AR1501 Cet metteur ne doit pas tre Co-plac ou ne fonctionnant en mme temps qu'aucune autre antenne oumetteur. Cet quipement devrait tre install et actionn avec une distance minimum de 20 centimtres entre le radiateur et votre corps. This radio transmitter 12290A-DT3A has been approved by Innovation, Science and Economic Development Canada to operate with the antenna types listed below, with the maximum permissible gain indicated. Antenna types not included in this list that have a gain greater than the maximum gain Le prsent metteur radio 12290A-DT3A a t approuv par Innovation, Sciences et Dveloppement conomique Canada pour fonctionner avec les types d'antenne numrs ci-dessous et ayant un gain admissible maximal. Les types d'antenne non inclus dans cette liste, et dont le gain est suprieur au gain maximal indiqu pour tout type figurant sur la liste, sont strictement interdits pour l'exploitation de l'metteur. The concrete contents to check are the following three points.

) Must use a PCB antenna with gain not exceeding those shown in the table below.

) Should be installed so that the end user cannot modify the antenna

) Feed line should be designed in 50ohm Fine tuning of return loss etc. can be performed using a matching network. Le contenu concret vrifier sont les trois points suivants. 1) doit utiliser une antenne PCB avec un gain ne dpassant pas ceux indiqus dans le tableau ci-dessous. 2) devrait tre install de sorte que lutilisateur ne puisse pas modifier lantenne 3) la ligne dalimentation devrait tre conue dans 50ohm Le rglage fin de la perte de retour, etc. peut tre effectu en utilisant un rseau correspondant. Antenna type and antenna gain:

2.4G WIFI&5G WIFI Antennas:

Antenna Frequency (MHz) Antenna Type MAX Antenna Gain (dBi) 1 2 2412-2462 2412-2462 PCB Antenna PCB Antenna 0.34 1.59 Antenna No. Frequency Band 1 2 5150-5850 5150-5850 Antenna Type PCB Antenna PCB Antenna Max Antenna Gain (dBi) 2.42 3.29 BT/BLE Antenna:

Antenna 1 Frequency (MHz) Antenna Type MAX Antenna Gain (dBi) 2402-2480 PCB Antenna

-4.01 Notice to OEM integrator Must use the device only in host devices that meet the FCC/ISED RF exposure category of mobile, which means the device is installed and used at distances of at least 20cm from persons. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. The end user manual shall include FCC Part 15 /ISED RSS GEN compliance statements related to the transmitter as show in this manual(FCC/Canada statement). Host manufacturer is responsible for compliance of the host system with module installed with all other applicable requirements for the system such as Part 15 B, ICES 003. Host manufacturer is strongly recommended to confirm compliance with FCC/ISED requirements for the transmitter when the module is installed in the host. PAGE 5 OF 6 Version 1.0 Hui Zhou Gaoshengda Technology Co., LTD DT3AR1501 The use condition limitations extend to professional users, then instructions must state that this information also extends to the host manufacturers instruction manual. Host manufacturer is strongly recommended to confirm compliance with FCC/ISED requirements for the transmitter when the module is installed in the host. Must have on the host device a label showing Contains FCC ID: 2AC23-DT3A or IC: 12290A-DT3A Both FCC ID and IC ID are not to be placed on the host at the same time and only hosts going into the US can use the FCC ID and only hosts going into Canada can use the IC ID. Installer should put it in the manual The device for operation in the band 51505250 MHz is only for indoor use to reduce the potential for harmful interference to co-channel mobile satellite systems l'hte doit utiliser l'instrument uniquement dans des dispositifs qui rpondent la fcc / (catgorie d'exposition rf mobile, ce qui signifie le dispositif est install et utilis une distance d'au moins 20 cm de personnes. le manuel de l'utilisateur final doit inclure la partie 15 / (fac rss gen dclarations de conformit relatives l'metteur que de montrer dans ce manuel. le fabricant est responsable de la conformit de l'hte, le systme d'accueil avec le module install avec toutes les autres exigences applicables du systme comme la partie 15 b, ices - 003. accueillir le fabricant est fortement recommand de confirmer la conformit avec les exigences de la fcc / (metteur lorsque le module est install dans l'hte. le dispositif d'accueil doivent avoir une tiquette indiquant contient FCC ID: 2AC23-DT3AIC: 12290A-DT3A Les personnes charges de l'installation devraient figurer dans le manuel:

Les dispositifs fonctionnant dans la bande de 5 150 5 250 MHz sont rservs uniquement pour une utilisation lintrieur afin de rduire les risques de brouillage prjudiciable aux systmes de satellites mobiles utilisant les mmes canaux. Doit avoir sur l'appareil hte une tiquette indiquant Contient l'ID FCC : 2AC23-DT3A ou IC : 12290A-DT3A L'ID FCC et l'ID IC ne doivent pas tre placs sur l'hte en mme temps et seuls les htes se rendant aux tats-Unis peuvent utiliser l'ID FCC et seuls les htes se rendant au Canada peuvent utiliser l'ID IC. PAGE 6 OF 6 Version 1.0

Hui Zhou Gaoshengda Technology Co.,LTD Date: 8/25/2023 Federal Communications Commissions Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 RE: CFR 47 2.911 (d)(5) Attestation FCC ID: 2AC23- DT3A Grantee's FRN:0023889280 1. Hui Zhou Gaoshengda Technology Co.,LTD certifies that the equipment for which authorization is sought is not covered equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. 2. Hui Zhou Gaoshengda Technology Co.,LTD certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List as an entity producing covered equipment and is not an affiliate or subsidiary of an entity identified on the Covered List. Sincerely yours, Name:

Job Title:

Hui Guan Manger Company Name: Hui Zhou Gaoshengda Technology Co.,LTD

Hui Zhou Gaoshengda Technology Co.,LTD Date: August 16, 2022 Federal Communications Commission 7435 Oakland Mills Road Columbia MD 21046 To whom it may concern:

I, the undersigned, hereby authorize UL Verification Services Inc. to act on our behalf in all manners relating to application for equipment authorization, including signing of all documents relating to these matters. Any and all acts carried out by UL Verification Services Inc. on our behalf shall have the same effect as acts of our own. I, the undersigned, hereby certify that we are not subject to a denial of federal benefits, that includes FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. 853(a). In authorizing UL Verification Services Inc. as our representative, we still recognize that we are responsible to:

a) comply with the relevant provisions of the certification program;

b) c) d) e) make all necessary arrangements for the conduct of the evaluation, including provision for examining documentation and access to all areas, records (including internal audit reports) and personnel for the purposes of evaluation (e.g. testing, inspection, assessment, surveillance, reassessment) and resolution of complaints;

make claims regarding certification only in respect of the scope for which certification has been granted;

do not use our product certification in such a manner as to bring the Certification Division into disrepute and not make any statement regarding our product certification which the Certification Division may consider misleading or unauthorized;

upon suspension or cancellation of certification, discontinue use of all advertising matter that contains any reference thereto and return any certification documents as required by the Certification Division;

f) g) h) i) j) use certification only to indicate the products are certified as being in conformity with specified standards;

endeavor to ensure that no certificate or report nor any part thereof is used in a misleading manner;

ensure that any reference to our product certification in communication media such as documents, brochures or advertising, complies with the requirements of the Certification Division;

keep a record of all complaints made known to us relating to the products compliance with requirements of the relevant standard and to make these records available to the when requested;

take appropriate action with respect to such complaints and any deficiencies found in products or services that affect compliance with the requirements for certification;

k) document the actions taken. This authorization is valid until further written notice from the applicant. Sincerely Yours, Signed by:

Company Name: Hui Zhou Gaoshengda Technology Co.,LTD Contact Name: Hui Guan Title of Person: Manger Address: No.2,Jin-da Road,Huinan High-tech Industrial Park, Huizhou, Guangdong, China

Hui Zhou Gaoshengda Technology Co.,LTD Federal Communications Commission 7435 Oakland Mills Road Columbia MD 21046 Subject:

Request for Confidentiality FCC ID:

To Whom It May Concern:

2AC23-DT3A Pursuant to the provisions of Sections 0.457 and 0.459 of the Commissions rules (47 CFR 0.457, 0.459), we are requesting the Commission to withhold the following attachments as confidential document from public disclosure indefinitely. Schematic Diagram Block Diagram Theory of Operation Above mentioned document contains detailed system and equipment description are considered as proprietary information in operation of the equipment. The public disclosure of above documents might be harmful to our company and would give competitor an unfair advantage in the market. It is our understanding that all measurement test reports, FCC ID label format and correspondent during certification review process cannot be granted as confidential documents and those information will be available for public review once the grant of equipment authorization is issued. Best Regards Company Name: Hui Zhou Gaoshengda Technology Co.,LTD Contact Name: Hui Guan Title of Person: Manger Address: No.2, Jin-da Road, Huinan High-tech Industrial Park, Huizhou, Guangdong, China Date: 08/25/2023

Modular Approval Request FCC (Per 15.212) FCC ID: 2AC23-DT3A Items to be covered Answer From Applicant Yes Yes Yes Yes Yes 1. The radio elements of the modular transmitter must have their own shielding. The physical crystal and tuning capacitors may be located external to the shielded radio elements. 2. The modular transmitter must have buffered modulation/data inputs (if such inputs are provided) to ensure that the module will comply with part 15 requirements under conditions of excessive data rates or over-modulation. 3. The modular transmitter must have its own power supply regulation. 4. The modular transmitter must comply with the antenna and transmission system requirements of 15.203, 15.204(b) and 15.204(c). The antenna must either be permanently attached or employ a unique antenna coupler (at all connections between the module and the antenna, including the cable). The professional installation provision of 15.203 is not applicable to modules but can apply to limited modular approvals under paragraph (b) of this section. 5. The modular transmitter must be tested in a stand-alone configuration, i.e., the module must not be inside another device during testing for compliance with part 15 requirements. Unless the transmitter module will be battery powered, it must comply with the AC line conducted requirements found in 15.207. AC or DC power lines and data input/output lines connected to the module must not contain ferrites, unless they will be marketed with the module (see 15.27(a)). The length of these lines shall be the length typical of actual use or, if that length is unknown, at least 10 centimeters to insure that there is no coupling between the case of the module and supporting equipment. Any accessories, peripherals, or support equipment connected to the module during testing shall be unmodified and commercially available

(see 15.31(i)). 6. The modular transmitter must be equipped with either a permanently affixed label or must be capable of electronically displaying its FCC identification number. Yes

(A) If using a permanently affixed label, the modular transmitter must be labeled with its own FCC identification number, and, if the FCC identification number is not visible when the module is installed inside another device, then the outside of the device into which the module is installed must also display a label referring to the enclosed module. This exterior label can use wording such as the following: Contains Transmitter Module FCC ID: XYZMODEL1 or Contains FCC ID:

XYZMODEL1. Any similar wording that expresses the same meaning may be used. The Grantee may either provide such a label, an example of which must be included in the application for equipment authorization, or, must provide adequate instructions along with the module which explain this requirement. In the latter case, a copy of these instructions must be included in the application for equipment authorization.

(B) If the modular transmitter uses an electronic display of the FCC identification number, the information must be readily accessible and visible on the modular transmitter or on the device in which it is installed. If the module is installed inside another device, then the outside of the device into which the module is installed must display a label referring to the enclosed module. This exterior label can use wording such as the following: Contains FCC certified transmitter module(s). Any similar wording that expresses the same meaning may be used. The user manual must include instructions on how to access the electronic display. A copy of these instructions must be included in the application for equipment authorization. 7. The modular transmitter must comply with any specific rules or operating requirements that ordinarily apply to a complete transmitter and the manufacturer must provide adequate instructions along with the module to explain any such requirements. A copy of these instructions must be included in the application for equipment authorization. 8. Radio frequency devices operating under the provisions of this part are subject to the radio frequency radiation exposure requirements specified in 1.1307(b), 1.1310, 2.1091, and 2.1093 of this chapter, as appropriate. Applications for equipment authorization of modular transmitters under this section must contain a statement confirming compliance with these requirements. The modular transmitter must comply with any applicable RF exposure requirements in its final configuration. Technical information showing the basis for this statement must be submitted to the Commission upon request. Yes Yes Note: If compliance with one or more of the numbered requirements, listed above, cannot be demonstrated, it may be possible to obtain a Limited Modular Approval (LMA). Hui Guan Title: Manager Company Name: Hui Zhou Gaoshengda Technology Co.,LTD Date: 08/25/2023

Hui Zhou Gaoshengda Technology Co.,LTD Confirmation Letter WE, Hui Zhou Gaoshengda Technology Co.,LTD The product: WIFI+BT Module And model No.: DT3AR1501 FCC ID: 2AC23-DT3A We declare that the software and associated drivers will not initiate any transmission on DFS frequencies without initiation by a master. This includes restrictions on transmissions for beacons and support for ad-hoc peer-to-peer modes. Best Regards Company Name: Hui Zhou Gaoshengda Technology Co.,LTD Contact Name: Hui Guan Title of Person: Manger Address: No.2, Jin-da Road, Huinan High-tech Industrial Park, Huizhou, Guangdong, China Date: 08/29/2023

Date: 3/13/2023 Federal Communications Commissions Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 RE: CFR 47 2.911 (d)(7) FCC US Agent Letter of Attestation Grantee Code: 2AC23 Grantee's FRN:0023889280 To whom it may concern:

FCC US Agent Agent Company NameVISHTEC LLC FCC FRN: 0033407131 Agent Contact Name: Alan Graham Agent US Address: 9888 W Belleview Ave Ste 2142 Denver CO 80123 Agent Email Address: Alan.graham@vish-tec.com This letter is to confirm that we have accepted the responsibility to act as US Agent on behalf of Hui Zhou Gaoshengda Technology Co.,LTD (the applicant). We are aware of the requirements and responsibilities of the applicants agent for service of process as outlined in the FCC section 2.911(d)(7) and Report and Order FCC 22-84 paragraph 63. Sincerely, Signature Authorized Agent Contact Person Name: Alan Graham Agent contact Job Title: Compliance manager Agent Company name: VISHTEC LLC

Hui Zhou Gaoshengda Technology Co.,LTD Date: 8/25/2023 Federal Communications Commissions Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 RE: CFR 47 2.911 (d)(7) Agent Designation Attestation FCC ID: 2AC23-DT3A Grantee's FRN:0023889280 Hui Zhou Gaoshengda Technology Co.,LTD as required by section 2.911(d)(7), designates the following agent, located in the United States, for purposes of acting as the applicants agent for service of process. The applicant acknowledges that they will maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any Commission-related proceeding involving the equipment. The applicant further acknowledges their responsibility under CFR 47 2.929(c) to inform the FCC whenever the agent information changes. U.S. Agent Information:

Agent Company NameVISHTEC LLC FCC FRN: 0033407131 Agent Contact Name: Alan Graham Agent US Address: 9888 W Belleview Ave Ste 2142 Denver CO 80123 Agent Email Address: Alan.graham@vish-tec.com Sincerely yours, Name:

Hui Guan Job Title:

Manger Company Name: Hui Zhou Gaoshengda Technology Co.,LTD