FCC ID: YTZ-TM8258 RF MODULE

TM-8258 VER 100 ZigBee Module INSTRUCTION This radio module will be embedded on the TMT ENGINEERING CO.,LTD. weighing scale, and therefore there is no users manual

- 1 -

1. Features This specification is applied to IEEE802.15.4 & RF4CE Module. This module is embedded with Amplifier and Single chip. 1.1. Description Bluetooth 5 Compliant, 1Mbps IEEE802.15.4 compliant, 250kbps 2.4GHz proprietary 1Mbps/250kbps mode with Adaptive Frequency Hopping feature support 64kB on-chip SRAM with up to up to 32kB retention 512kB internal Flash Rx sensitivity:

IEEE802.15.4 250kbps Tx output power: Typ. +10dBm RSSI monitoring with +/-1dB resolution Power supply: 1.8V~3.6V

-98dBm@BLE 1Mbps,

-100dBm@

2. Recommended operating condition Item Sym. Min Typ. Max Unit Condition VDD 1.8 3.3 3.6 V power supply Power-supply voltage Operating Temperature Range TOpr

-10 45

- 2 -

3. RF TX Characteristics(+25) Item Spec. Remark Frequency Range 2400~2483.5MHz Frequency Tolerance Occupied B.W

<20ppm

<2.2MHz Output Power (Max) 10dBm (+0/-2dB) VSWR Flatness Spurious Emissions 1GHz Under 1GHz ~ 2.4GHz

~ 12GHz 2nd Harmonic 3rd Harmonic PSD 3.5MHz Secondary Radiated Emission

<2.0 : 1

<2dB

<-70dBm

<-70dBm

<-70dBm

<-60dBm

<-60dBm

>30dBc

<-70dBm

- 3 -

20dBc over Limit of secondary radiated emissions. 4. Dimensions

- 4 -

5. Protocol(38400 bps , N, 8, 1) 7.1 Send Data Header : 0x21 + Data Ex> Data 3byte 0x30, 0x31, 0x32 0x21 + 0x30 + 0x31 + 0x32 7.2 Pan ID Set Header : 0x12 + PAN ID(2byte) + Sum(PAN ID 2byte) Ex> Pan ID : 0x31, 0x43 0x12 + 0x31 + 0x 43 + 0x74(0x31+ 0x43) FCC approval This device complies with Part 15 of the FCC`s 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 undesirable operation. To satisfy FCC exterior labeling requirements, the following text must be placed on the exterior of the end product. Contains Transmitter module FCC ID: YTZ-TM8258 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.

-The OEM integrator is responsible for ensuring the end-user has no manual instruction to remove or install module.

-The module is limited to installation in mobile or fixed applications.

- 5 -

IMPORTANT NOTE This device complies with FCC radiation exposure limits set forth for an uncontrolled environment. This device should be installed and must not be co-located or operating in conjunction with any other antenna or transmitter. This device is intended only for OEM integrators under the following conditions:

1) This module may not be co-located with any other transmitters or antennas. 2) The antenna must be installed such that 20cm is maintained between the antenna and users. As long as 2 conditions above are met, further transmitter test will not be required. However, the OEM integrator is still responsible for testing their end-product for any additional compliance requirements with this module installed. In the event that these conditions cannot be met, then the FCC authorizations are no longer considered valid and the FCC ID cannot be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product including this module and obtaining separate FCC authorizations.

[MEMO]

- 6 -

CTK Co., Ltd.

(Ho-dong), 113, Yejik-ro, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea Tel: +82-31-339-9970 Fax: +82-31-624-9501 www.e-ctk.com Label Photographs

701 Gangbuk Electronics Complex, Deongneung-

ro 40gil 74, Gangbuk-gu, Seoul, KOREA 01138 Tel No : +82-70-4334-5694 Fax No : +82-02-987-8007 Federal Communications Commission Authorization and Evaluation Division Confidentiality Request regarding application for certification of FCC ID: YTZ-TM8258 Pursuant to Sections 0.457 and 0.459 of the Commissions Rules, we hereby request confidential treatment of information accompanying this application as outlined below:

Exhibit Type Block Diagram Schematics Parts List Operational description File Name

(TM8258)_Block Diagram.pdf

(TM8258)_Schematics.pdf

(TM8258)_Schematics PCB Layout.pdf

(TM8258)_Part List.pdf

(TM8258) _Operational Description.pdf

(TM8258)_Antenna Specification Operational Description.pdf The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. The applicant understands that pursuant to Section 0.457 of the Rules, disclosure of this application and all accompanying documentation will not be made before the date of the Grant for this application. Pursuant to DA04-1705 June 15, 2004 of the Commissions public notice, we also request temporary confidential treatment of information accompanying this application as outlined below:

Exhibit Type Sincerely, File Name Hoon Lee / Chief Engineer TMT ENGINEERING Co., Ltd. Rev 11/20/07

701 Gangbuk Electronics Complex, Deongneung-

ro 40gil 74, Gangbuk-gu, Seoul, KOREA 01138 Tel No : +82-70-4334-5694 Fax No : +82-02-987-8007 MODEL ATTESTATION COVER LETTER Date: 2020-04-10 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Attn: OET Dept. FCC ID: YTZ-TM8258 Product/ Model Number : RF MODULE / TM8258 Addition of model name as follow:

- Basic Model name : TM8258

- Variant Model name : TM8258A, TM8258B Model Name TM8258 TM8258A TM8258B Basic model name Description Variant Model name, Changing the antenna mounting direction Variant Model name, Changing the antenna mounting direction TM8258 (Basic Model) TM8258A (Variant Model) TM8258B (Variant Model) Sincerely, Hoon Lee / Chief Engineer TMT ENGINEERING Co., Ltd.

701 Gangbuk Electronics Complex, Deongneung-ro 40gil 74, Gangbuk-gu, Seoul, KOREA 01138 Tel No : +82-70-4334-5694 Fax No : +82-02-987-8007 MODULAR APPROVAL LETTER 2020-04-10 Applicant : TMT ENGINEERING Co., Ltd. FCC ID : YTZ-TM8258 We would like to answer for Single Modular Approval in accordance with the requirement of rule part 15.212 as described below No. Requirements Comment Comply (Y/N) The radio element of the modular transmitter has its own shielding Refer to the external photo The modular transmitter must have buffered modulation data/inputs (if such inputs are provided) All input to the modules are buffered through microprocessor inputs. The modular transmitter must have its own power supply regulation. The modular transmitter must comply with the antenna requirements of Section 15.203 and 15.204(c). The modular transmitter must be tested in a stand-alone configuration, i.e., the module must not be inside another device during testing. The modular transmitter must be labeled with its own FCC ID. If the FCC ID 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 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 The modular transmitter must comply with any applicable RF exposure requirements Internal power regulators Refer to the Block-diagram Refer to the internal photo The EUT was tested in a standalone configuration via a SD extension cable Refer to the test setup photo Refer to the user manual Refer to the user manual Refer to the RF exposure statement for more details. Y Y Y Y Y Y Y Y 1 2 3 4 5 6 7 8 Sincerely, Hoon Lee / Chief Engineer TMT ENGINEERING Co., Ltd.

701 Gangbuk Electronics Complex, Deongneung-

ro 40gil 74, Gangbuk-gu, Seoul, KOREA 01138 Tel No : +82-70-4334-5694 Fax No : +82-02-987-8007 Special Power of Attorney I, Hoon Lee of TMT ENGINEERING Co., Ltd. hereby authorize appoint WonJae, Hwang of CTK Co., Ltd. to represent me to act on my behalf to do any and all of the following :

Sign on my behalf the agency, anti-drug and confidentiality cover letters and apply to FCC for the products. The right, powers and authority in fact to exercise any and all of the rights and powers herein granted shell commence and be in full force from 2020/04/10 and continue to effective unless specifically terminated by either party. Applicant : TMT ENGINEERING Co., Ltd. FCC ID : YTZ-TM8258 Dated 2020/04/10 Sincerely, Hoon Lee / Chief Engineer TMT ENGINEERING Co., Ltd.