2A2MWSTWR3PWireless Anemometer

Scarlet Tech Co. Ltd. 347 4F-3, HePing E Rd, 2nd Sec, Daan Dist Taipei City Taiwan 106 Federal Communications Commission Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 Date: 2021.08.12 Request for Long-Term Confidentiality Company name: Scarlet Tech Co. Ltd. FCC ID: 2A2MWSTWR3P FCC Part 15 Certification To whom it may concern: In accordance with §§ 0.457(d) and 0.459 of CFR 47, Scarlet Tech Co. Ltd. hereby requests Long-Term confidentiality of all Block Diagrams, Schematics, Operational Description attachments for the subject application. These documents contain detailed system and equipment description and related information about the product which Scarlet Tech Co. Ltd. considers to be proprietary, confidential and a custom design and otherwise would not release to the general public. Since the design is a basis from which future technological products will evolve, Scarlet Tech Co. Ltd. considers that this information would be of benefit to its competitors and that the disclosure of the information in these documents would give competitors an unfair advantage in the market. Sincerely, Signature Name: David Huang Title: Dr. Company: Scarlet Tech Co. Ltd.

Registration number: W6M22106-21039-FCC FCC ID: 2A2MWSTWR3P Worldwide Testing Services(Taiwan) Co., Ltd. Appendix Page 2 of 14 External Photos Registration number: W6M22106-21039-FCC FCC ID: 2A2MWSTWR3P Worldwide Testing Services(Taiwan) Co., Ltd. Appendix Page 3 of 14 Registration number: W6M22106-21039-FCC FCC ID: 2A2MWSTWR3P Worldwide Testing Services(Taiwan) Co., Ltd. Appendix Page 4 of 14

Registration number: W6M22106-21039-FCC FCC ID: 2A2MWSTWR3P Worldwide Testing Services(Taiwan) Co., Ltd. Appendix Page 5 of 14 Internal Photos Registration number: W6M22106-21039-FCC FCC ID: 2A2MWSTWR3P Worldwide Testing Services(Taiwan) Co., Ltd. Appendix Page 6 of 14 Registration number: W6M22106-21039-FCC FCC ID: 2A2MWSTWR3P Worldwide Testing Services(Taiwan) Co., Ltd. Appendix Page 7 of 14 Registration number: W6M22106-21039-FCC FCC ID: 2A2MWSTWR3P Worldwide Testing Services(Taiwan) Co., Ltd. Appendix Page 8 of 14 Registration number: W6M22106-21039-FCC FCC ID: 2A2MWSTWR3P Worldwide Testing Services(Taiwan) Co., Ltd. Appendix Page 9 of 14 Registration number: W6M22106-21039-FCC FCC ID: 2A2MWSTWR3P Worldwide Testing Services(Taiwan) Co., Ltd. Appendix Page 10 of 14

Scarlet Tech Co. Ltd. 347 4F-3, HePing E Rd, 2nd Sec, Daan Dist Taipei City Taiwan 106 Federal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 Applicant’s declaration concerning RF Radiation Exposure We hereby indicate that the product Product description: Wireless Anemometer Model No: WR-3 Plus_Wind Sensor The equipment complies with FCC RF radiation exposure limits set forth for an uncontrolled environment. The integral antennas used for this transmitter must not be co-located or operating in conjunction with any other antenna or transmitter within the host device. A safety statement concerning minimum separation distances from enclosure of the Product: Wireless Anemometer will be integrated in the user’s manual to provide end-users with transmitter operating conditions for satisfying RF exposure compliance. The appropriate information can be drawn from the test report no: W6M22106-21039-C-1 and the accompanying calculations. Company: Scarlet Tech Co. Ltd. Address: 347 4F-3, HePing E Rd, 2nd Sec, Daan Dist Taipei City Taiwan 106 Date: 2021.08.10 Signature Registration number: W6M22106-21039-C-1 FCC ID: 2A2MWSTWR3P Worldwide Testing Services(Taiwan) Co., Ltd. Page 16 of 31 3.2 Equivalent Isotropic Radiated Power (EIRP) FCC Rule: 15.247(b)(3) EIRP = max. conducted output power + antenna gain EIRP = 7.75 dBm + ((-1.56) dBi [antenna gain claimed by manufacturer] = 6.19 dBm = 4.1591 mW 3.3 Exemption Limits for Routine Evaluation according to 47 CFR FCC Part 2 Subpart J, section 2.1091 FCC OET Bulletin 65 Edition 97.01 determines the equations for predicting RF fields and applicable limits. The prediction for power density in the far-field but will over-predict power density in the near field, where it could be used for walking a “worst case” or conservative prediction. Systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy levels in excess limit for maximum permissible exposure. In accordance with 47 CFR FCC Part 2 Subpart J, section 2.1091 this device has been defined as a mobile device whereby a distance of 20 cm normally can be maintained between the user and the device. MPE Calculation Method E ＝ Electric field (V/m) P ＝ output power (W) G ＝ EUT Antenna numeric gain (numeric) d ＝ Separation distance between radiator and human body (m) The formula can be changed to mW/cm 2 . Registration number: W6M22106-21039-C-1 FCC ID: 2A2MWSTWR3P Worldwide Testing Services(Taiwan) Co., Ltd. Page 17 of 31 Established separation distance is 20 cm. Operating frequency band : 902.9-926.6 MHz The product meets RF exposure requirement. Because the power density of 0.0008 mW/cm 2 at 902.9 MHz is below the power density limit of 0.6019 mW/cm 2 .

Of Applicant: Scarlet Tech Co Ltd Address: 4F-3, 347 HePing E Rd, 2nd Sec, DaAn Dist, Taipei, Taiwan 106 Tested and Prepared By Worldwide Testing Services (Taiwan) Co., Ltd. FCC Registration No.: TW1477, TW0020, TW1072 Industry Canada filed test laboratory Reg. No. 20037 Report No.: W6M22106-21039-C-1 6F, NO. 58, LANE 188, RUEY-KUANG RD., NEIHU TAIPEI 114, TAIWAN, R.O.C. TEL: 886-2-66068877 FAX: 886-2-66068879 E-mail: [email protected] 47 CFR PART 15 SUBPART C TEST REPORT for Wireless Anemometer Model No.: WR-3 Plus_Wind Sensor FCC ID: 2A2MWSTWR3P Registration number: W6 M22106-21039-C-1 FCC ID: 2A2MWSTWR3P Worldwide Testing Services(Taiwan) Co., Ltd. Page 1 of 31 TABLE OF CONTENTS 1 GENERAL INFORMATION ......................................................................................................................................... 2 1.1 NOTES ...................................................................................................................................................................... 2 1.2 TESTING LABORATORY ............................................................................................................................................. 3 1.2.1 Location .............................................................................................................................................................. 3 1.2.2 Details of accreditation status ............................................................................................................................ 3 1.3 DETAILS OF APPROVAL HOLDER ............................................................................................................................... 3 1.4 APPLICATION DETAILS .............................................................................................................................................. 4 1.5 GENERAL INFORMATION OF TEST ITEM ..................................................................................................................... 4 1.6 TEST STANDARDS ..................................................................................................................................................... 5 2 TECHNICAL TEST ........................................................................................................................................................ 6 2.1 SUMMARY OF TEST RESULTS ..................................................................................................................................... 6 2.2 TEST ENVIRONMENT ................................................................................................................................................. 6 2.3 TEST EQUIPMENT LIST .............................................................................................................................................. 7 2.4 GENERAL TEST PROCEDURE ................................................................................................................................... 10 3 TEST RESULTS (ENCLOSURE) ............................................................................................................................... 12 3.1 PEAK OUTPUT POWER (TRANSMITTER) ................................................................................................................... 13 3.2 EQUIVALENT ISOTROPIC RADIATED POWER (EIRP) ............................................................................................... 16 3.3 EXEMPTION LIMITS FOR ROUTINE EVALUATION ACCORDING TO ............................................................................ 16 3.4 TRANSMITTER RADIATED EMISSIONS IN RESTRICTED BANDS ................................................................................ 18 3.5 SPURIOUS EMISSIONS (TX) ...................................................................................................................................... 19 3.6 RADIATED EMISSION ON THE BAND EDGE ............................................................................................................... 21 3.7 MINIMUM 6 DB BANDWIDTH .................................................................................................................................. 23 3.8 PEAK POWER SPECTRAL DENSITY .......................................................................................................................... 26 3.9 RADIATED EMISSION FROM RECEIVER PART .... ............................................................ ...........................................29 3.10 POWER LINE CONDUCTED EMISSION ...................................................................................................................... 30 APPENDIX.............................................................................................................31 Registration number: W6M22106-21039-C-1 FCC ID: 2A2MWSTWR3P Worldwide Testing Services(Taiwan) Co., Ltd. Page 2 of 31 1 General Information 1.1 Notes The purpose of conformity testing is to increase the probability of adherence to the essential requirements or conformity specifications, as appropriate. The complexity of the technical specifications, however, means that full and thorough testing is impractical for both technical and economic reasons. Furthermore, there is no guarantee that a test sample which has passed all the relevant tests conforms to a specification. Neither is there any guarantee that such a test sample will interwork with other genuinely open systems. The existence of the tests nevertheless provides the confidence that the test sample possesses the qualities as maintained and that is performance generally conforms to representative cases of communications equipment. The test results of this test report relate exclusively to the item tested as specified in 1.5. The test report may only be reproduced or published in full. Reproduction or publication of extracts from the report requires the prior written approval of the Worldwi…

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Registration number: W6M22106-21039-FCC FCC ID: 2A2MWSTWR3P Worldwide Testing Services(Taiwan) Co., Ltd. Appendix Page 11 of 14 Set Up Photo of Radiated Emission EMI Below 1 GHz Registration number: W6M22106-21039-FCC FCC ID: 2A2MWSTWR3P Worldwide Testing Services(Taiwan) Co., Ltd. Appendix Page 12 of 14 Above 1 GHz Registration number: W6M22106-21039-FCC FCC ID: 2A2MWSTWR3P Worldwide Testing Services(Taiwan) Co., Ltd. Appendix Page 13 of 14 RF Below 1 GHz Registration number: W6M22106-21039-FCC FCC ID: 2A2MWSTWR3P Worldwide Testing Services(Taiwan) Co., Ltd. Appendix Page 14 of 14 Above 1 GHz