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Appendix FCC ID Label FCCID:2A23L-NBD-ADH0 Model: NBD-ADH0 This device 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. Size for the label: 20mm 20mm FCC ID: 2A23L-NBD-ADH0 TB-RF-074-1.0 Appendix ID Label Location ID LOCATION FCC ID: 2A23L-NBD-ADH0 TB-RF-074-1.0

Date: 2022-2-18 FCC ID: 2A23L-NBD-ADHO Dear Sir/Madam, We, NBDair Inc. Hereby declares the following statement for Federal Communications Commission, PCB board, circuit, structure and internal of these model(s) are the same, Only model number is different for these model:

Product name: Desktop Air Purifier Model no.: NBD-ADHO , NBD-ADH1 NBD-ADH2, NBD-ADH3, NBD-ADH4, NBD-ADH5, NBD-ADH6, NBD-ADH7, NBD-ADH8, NBD-ADH9, NBD-ADUO, NBD-ADU1, NBD-ADU2, NBD-ADU3, NBD-ADU4, NBD-ADU5, NBD-ADU6, NBD-ADU7, NBD-ADU8, NBD-ADU9 Sincerely, sy Name/Title : Yi Yan/CEO Company: NBDair Inc. Address: 1023 Walnut Street, #100, Boulder, CO 80302 U.S.A Phone: 303-800-4852 Fax: 0755-26509195 E-Mail: info@nbdair.com

CONFIDENTIALITY REQUEST for Certification Service in USA Federal Communication Commission Equipment Authorization Division, Application Processing Branch 7435 Oakland Mills Road Columbia, MD 21046 Date:<2022-2-18>

Pursuant to Paragraphs 0.457 and 0.459 of the Commissions Rules (47 C.F.R.) and Section 552(b)(4) of the Freedom of Information Act, we requests confidentiality for the following products:

FCG ID Model name 2A23L-NBD-ADHO NBD-ADHO For the product stated above, we request that the following information be held confidential:

Exhibits Long-Term Confidentialit Short-Term Confidentialit Short-Term Confidentiality Days Block Diagram External Photos Internal Photos L]

| Schematics Test Setup Photos

| User's Manual Parts List Tune Up a :

| Operational Descriptions x The long-term confidentiality exhibits contain our trad information that could be of benefit to our competitors. e secrets and proprietary The short-term confidentiality on the basis of ensuring that business sensitive information remains confidential until the actual marketing of our new device. If you have any questions, please feel free to contact me at the address shown below. Sincerely, Name/Title: Yi Yan/CEO Company: NBDair Inc. Address: 1023 Walnut Street, #100, Boulder, CO 80302 U.S.A Phone: 303-800-4852 Fax: 0755-26509195 E-Mail: info@nbdair.com

NBDair Inc. 1023 Walnut Street, #100, Boulder, CO 80302 U.S.A Date: 2022-2-18 FCC ID; 2A23L-NBD-ADH0 Model Number: NBD-ADHO To:

Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD To Whom It May Concern, We, NBDair Inc., declare that this EUT (FCC ID: 2A23L-NBD-ADHO) doesnt have Ad Hoc mode function on non-US/Canada frequencies. In addition. The frequency selection feature is disabled by firmware for devices marked to the US/Canada. For DTS part of this device, only channels 1-11 will be used in North America, Country code selection is disabled. Should you have any questions or comments regarding this matter, please have my best attention. Sincerely, Name/Title: Yi Yan/CEO Company: NBDair Inc. Address: 1023 Walnut Street, #100, Boulder, CO 80302 U.S.A Phone: 303-800-4852 Fax: 0755-26509195 E-Mail: info@nbdair.com

NBDair Inc. 1023 Walnut Street, #100, Boulder, CO 80302 U.S.A Federal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 2022-2-18 To whom it may concern:

We, NBDair Inc. the undersigned, hereby authorize Eurofins Product Service GmbH to act on our behalf in all matters relating to applications for equipment authorization FCC ID: 2A23L-NBD-

ADHO including the signing of all documents related to these matters. Any and all acts carried out by Eurofins Product Service GmbH on our behalf shall have the same effect as acts of our own. We also hereby certify that no party to this application is subject to a denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. 862. Sincerely, Name/Title : Yi Yan/CEO Company: NBDair Inc. Address: 1023 Walnut Street, #100, Boulder, CO 80302 U.S.A Phone: 303-800-4852 Fax: 0755-26509195 E-Mail: info@nbdair.com