2AWMOMHOH411Mini Air Quality Monitor (Carbon Dioxide)

Miaomiaoce Technology (Beijing) Co., Ltd Federal Communications Commission Authorization and Evaluation Division Confidentiality Request regarding application for certification of FCC ID: 2AWMOMHOH411 Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules, we hereby request confidential treatment of information accompanying this application as outlined below: Exhibit Type File Name Block Diagram, Schematics, Operational Description, Block Diagram Operation Description schematic diagram 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. Sincerely, Lei Cheng Miaomiaoce Technology (Beijing) Co., Ltd

Miaomiaoce Technology (Beijing) Co., Ltd Federal Communications Commission Authorization and Evaluation Division 1435 Oakland Mills Road Columbia, MD 21046 Date: 2022-12-05 SUBJECT: FCC Application for FCC ID: 2AWMOMHOH411 To Whom It May Concern: We, the undersigned, hereby authorize Lisa Wang at EMTEK (SHENZHEN) CO., LTD. on our behalf, to apply to the Federal Communications Commission on our equipment. Any and all acts carried out by EMTEK (SHENZHEN) CO., LTD. on our behalf shall have the same effect as acts of our own. This is to advise that we are in full compliance with the Anti- Drug Abuse Act. We, the applicant, are not subject to a denial of federal benefits pursuant to Section 5301 of the Anti-Drug Act of 1988, 21 USC853a, and no party to the application is subject to a denial of federal benefits pursuant to that section. Regards, Lei Cheng Miaomiaoce Technology (Beijing) Co., Ltd

Miaomiaoce Technology (Beijing) Co., Ltd Date: 2022-12-05 To: Federal Communications Commission 7435 Oakland Mills Road Columbia, MD FCC ID: 2AWMOMHOH411 To Whom It May Concern: This letter is to ascertain that Miaomiaoce Technology (Beijing) Co., Ltd Production name Trade name Model no. Mini Air Quality Monitor (Carbon Dioxide) N/A MHO-H411 Has been the units used for conducting FCC compliance testing, the SDoC part will be tested by EMTEK (SHENZHEN) CO., LTD. If you have any question or concerns, pls. contact us. Sincerely, Client’s signature ： Client’s name / title ： Lei Cheng Contact information / address: Miaomiaoce Technology (Beijing) Co., Ltd /No. 1-Y1-06, 1F, Tower A, Innovation Building, No. 11 HEPINGLI East Street, Dongcheng District, Beijing, China

Page 1 of 3 EXTERNAL PHOTOS Page 2 of 3 Page 3 of 3 ----- The End -----

Page 1 of 3 INTERNAL PHOTOS Page 2 of 3 BT Module Antenna Page 3 of 3 ----- The End -----

FCC ID: 2AWMOMHOH411 Portable device According to §15.247(i) and §1.1307(b)(1), 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 level in excess of the Commission’s guidelines. According to KDB447498 D01 General RF Exposure Guidance V06 The 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances ≤ 50 mm are determined by: [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)] * [√f(GHz)] ≤ 3.0 for 1-g SAR and ≤ 7.5 for 10-g extremity SAR, where f(GHz) is the RF channel transmit frequency in GHz； Power and distance are rounded to the nearest mW and mm before calculation； The result is rounded to one decimal place for comparison； The test exclusions are applicable only when the minimum test separation distance is ≤ 50 mm and for transmission frequencies between 100 MHz and 6 GHz. When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion. We use 5mm as separation distance to calculate. Maximum measured transmitter power: BLE: Transmit Frequency (GHz) Mode peak conducted output power (dBm) tune up maximum power Result calculation 1-g SAR 2402 BLE_1M GFSK 0.51 1 0.3902 3 2440 BLE_1M GFSK -0.59 0 0.3124 3 2480 BLE_1M GFSK -1.34 0 0.3150 3 2402 BLE_2M GFSK 0.49 1 0.3902 3 2440 BLE_2M GFSK -0.61 0 0.3124 3 2480 BLE_2M GFSK -1.38 0 0.3150 3 Conclusion: For the max result : 0.3902 ≤ 3.0 for 1-g SAR extremity SAR, No SAR is required. Signature: Date: 2022.12.29 NAME AND TITLE (Please print or type): Lisa Wang/Manager COMPANY (Please print or type): Shenzhen EMTEK Co.,Ltd./Building 69, Majialong Industry Zone, Nanshan District, Shenzhen, Guangdong, China

Report No. ENS2209300010W00701R Page 1 of 50 Ver.1.0 TEST REPORT Product Name ： Mini Air Quality Monitor (Carbon Dioxide) Model Number ： MHO-H411 FCC ID ： 2AWMOMHOH411 Prepared for : Miaomiaoce Technology (Beijing) Co.,Ltd. Address : No. 1-Y1-06, 1F, Tower A, Innovation Building, No. 11 HEPINGLI East Street, Dongcheng District, Beijing, China Prepared by : EMTEK (SHENZHEN) CO., LTD. Address : Building 69, Majialong Industry Zone, Nanshan District, Shenzhen, Guangdong, China Tel: (0755) 26954280 Fax: (0755) 26954282 Report Number : ENS2209300010W00701R Date(s) of Tests : November 01, 2022 to December 05, 2022 Date of issue : December 05, 2022 $二维码$ Report No. ENS2209300010W00701R Page 2 of 50 Ver.1.0 Table of Contents 1 TEST RESULT CERTIFICATION ........................................................................................................................ 3 2 EUT TECHNICAL DESCRIPTION ....................................................................................................................... 5 3 SUMMARY OF TEST RESULT ........................................................................................................................... 6 4 TEST METHODOLOGY ....................................................................................................................................... 7 4.1 GENERAL DESCRIPTION OF APPLIED STANDARDS ............................................................................... 7 4.2 MEASUREMENT EQUIPMENT USED .......................................................................................................... 7 4.3 DESCRIPTION OF TEST MODES................................................................................................................. 9 5 FACILITIES AND ACCREDITATIONS .............................................................................................................. 10 5.1 FACILITIES .................................................................................................................................................. 10 5.2 LABORATORY ACCREDITATIONS AND LISTINGS ................................................................................. 10 5.3 TEST SOFTWARE ...................................................................................................................................... 10 6 TEST SYSTEM UNCERTAINTY ........................................................................................................................ 11 7 SETUP OF EQUIPMENT UNDER TEST ........................................................................................................... 12 7.1 RADIO FREQUENCY TEST SETUP 1 ........................................................................................................ 12 7.2 RADIO FREQUENCY TEST SETUP 2 ........................................................................................................ 12 7.3 CONDUCTED EMISSION TEST SETUP ..................................................................................................... 13 7.4 SUPPORT EQUIPMENT ............................................................................................................................. 14 8 TEST REQUIREMENTS .................................................................................................................................... 15 8.1 DTS 6DB BANDWIDTH ............................................................................................................................... 15 8.2 MAXIMUM PEAK CONDUCTED OUTPUT POWER ................................................................................... 18 8.3 MAXIMUM POWER SPECTRAL DENSITY ................................................................................................. 21 8.4 UNWANTED EMISSIONS IN NON-RESTRICTED FREQUENCY BANDS ................................................. 24 8.5 RADIATED SPURIOUS EMISSION ............................................................................................................. 34 8.6 CONDUCTED EMISSIONS TEST ............................................................................................................... 46 8.7 ANTENNA APPLICATION ........................................................................................................................... 49 Report No. ENS2209300010W00701R Page 3 of 50 Ver.1.0 1 TEST RESULT CERTIFICATION Applicant : Miaomiaoce Technology （Beijing）Co.,Ltd. Address： No. 1-Y1-06, 1F, Tower A, Innovation Building, No. 11 HEPINGLI East Street, Dongcheng District, Beijing, China Manufacturer : Miaomiaoce Technology （Beijing）Co.,Ltd. Address： No. 1-Y1-06, 1F, Tower A, Innovation Building, No. 11 HEPINGLI East Street, Dongcheng District, Beijing, China EUT : Mini Air Quality Monitor (Carbon Dioxide) Model Name : MHO-H411 Trademark : N/A Measurement Procedure Used: APPLICABLE STANDARDS STANDARD TEST RESULT FCC 47 CFR Part 2 , Subpart J FCC 47 CFR Part 15, Subpart C PASS The above equipment was tested by EMTEK(SHENZHEN) CO., LTD. The test data, data evaluation, test procedures, and equipment configurations shown in this report were made in accordance with the procedures given in ANSI C63.10 (2013) and the energy emitted by the sample EUT tested as described in this report is in compliance with the requirements of FCC Rules Part 2 and Part 15.247 The test results of this report relate only to the tested sample identified in this report Date of Test : November 01, 2022 to December 05, 2022 Prepared by : Jessie Hu/Editor Reviewer : Kaimin Guo/Supervisor Approved & Authorized Signer : Lisa Wang/Manager Report No. ENS2209300010W00701R Page 4 of 50 Ver.1.0 Modified History Version Report No. Revision Date Summary Ver.1.0 ENS2209300010W00701R / Original Report Report No. ENS2209300010W00701R Page 5 of 50 Ver.1.0 2 EUT TECHNICAL DESCRIPTION Product: Mini Air Quality Monitor (Carbon Dioxide) Model Number: MHO-H411 Sample: 2# Data Rate : Up to 2Mbps Modulation: GFSK Operating Frequen…

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ReportNo.:RFI-LAB-RF-202211-KK30 QP030-E11 Page1of9 TestingReport CustomerName:MiaomiaoceTechnology （ Beijing ） Co.,Ltd. ProductName:MiniAirQualityMonitor(CO2) SampleModel:MHO-H411 ReferenceStandard:GB/T9410-2008;ANSI/IEEEStd149-1979 IssueDate:2022.11.17 Engineer:Date: Auditor:Date: Approver:Date: ReportNo.:RFI-LAB-RF-202211-KK30 QP030-E11 Page2of9 Version VersionNo.DateDescriptionFormulateApproval A02022.11.17Forthefirsttime,formulateJacksonEason Contents 1.GeneralInformation.........................................................................................................................3 1.1Generalinformationoftestinginstitutions...........................................................................3 1.2Testingprinciple...................................................................................................................3 1.3Testequipment......................................................................................................................4 1.4Testenvironment...................................................................................................................4 1.5Statement..............................................................................................................................4 2.SampleInformation.........................................................................................................................5 2.1Clientinformation.................................................................................................................5 2.2DescriptionofEUT(S)..........................................................................................................5 2.3EUTappearance....................................................................................................................6 2.4DUTsetupphotooffreespaceOTAtesting........................................................................6 3.TestResults......................................................................................................................................7 3.1Teststandard.........................................................................................................................7 3.2Testuncertainty.....................................................................................................................7 3.3Testdata................................................................................................................................8 3.3.2Typicalfreespaceefficiencyandgain......................................................................8 3.3.3Typicalfreespaceradiationpattern...........................................................................8 （Thefollowingisblank）................................................................................................................9 ReportNo.:RFI-LAB-RF-202211-KK30 QP030-E11 Page3of9 1.GeneralInformation 1.1Generalinformationoftestinginstitutions Name ShenzhenRFI-LABCommunicationTechnologyCo.,Ltd. Address 10/FA,LingyunBld,LiufangRd,BaoanDistrict,SZ Tel 13682621346 E-mail [email protected] Equipment Alltheequipmentusedinthereportisfixedin 10/FA,LingyunBld,LiufangRd,BaoanDistrict,SZ 1.2Testingprinciple ReportNo.:RFI-LAB-RF-202211-KK30 QP030-E11 Page4of9 1.3Testequipment EquipmentModelNo.SerialNo.Manufacturer Calibration date Next calibration date 16probe microwave chamber 3*3*2.5 RFI-LAB-RF -A00 SUNYIELD2021.3.152023.3.14 Network Analyzer E5071C RFI-LAB-RF -A02 Agilent 2022.5.132023.5.12 1.4Testenvironment Temperature 24.1°C Humidity 58%RH Pressure 100.15kPa 1.5Statement (1)Thetestresultsinthereportareonlyapplicabletothetestedsamplesandthetestedsamples workundertheenvironmentdescribedinthereport. (2)OnlyShenzhenRFI-LABCommunicationTechnologyCo.,Ltd.havetherighttomodifythe report,andthemodificationinformationshallbeannotatedintherevisionform. (3)Anyobjectiontothisreportshallberaisedwithin30daysafterformalconfirmationofthe report. (4)Thisreportisinvalidifthereisanyevidencethatthesampleinformationprovidedisfalsified. (5)Thereportisinvalidwithoutthesignatureoftheauditorandapprover. ReportNo.:RFI-LAB-RF-202211-KK30 QP030-E11 Page5of9 2.SampleInformation 2.1Clientinformation Name MiaomiaoceTechnology（Beijing）Co.,Ltd. Address No.1-Y1-06,1F,TowerA,InnovationBuilding,No.11HEPINGLI EastStreet,DongchengDistrict,Beijing,China Contacts ChengLei Tel 18810673534 E-mail [email protected] 2.2DescriptionofEUT(S) ProductName MiniAirQualityMonitor(CO2) SampleModel MHO-H411 Size / SerialNo. / TestItem Antennagain;Efficiency;Radiationpattern FrequencyRange 2400-2500MHz ReceivedDate 2022.11.11 TestDate 2022.11.17 Remark ThelengthoftheRFcableis40mm ReportNo.:RFI-LAB-RF-202211-KK30 QP030-E11 Page6of9 2.3EUTappearance 2.4DUTsetupphotooffreespaceOTAtesting Planform Frontview ReportNo.:RFI-LAB-RF-202211-KK30 QP030-E11 Page7of9 3.TestResults 3.1Teststandard NameParameterMethodStandardno. Mobile communication antenna Antennagain Genericspecification forantennasusedinthe mobilecommunications GB/T 9410-2008 Radiationpattern Antenna Radiationefficiency IEEEStandardTest ProceduresforAntennas ANSI/IEEEStd 149-1979 Gainanddirectivity 3.2Testuncertainty TheuncertaintywascalculatedonthebasisoftheGUMpublishedbyISO,usingthe inclusionfactorofK=2andthe95%confidenceleveltoexpresstheextended uncertainty. ItemUncertainty Antennagain±1dB Radiationefficiency±10% ReportNo.:RFI-LAB-RF-202211-KK30 QP030-E11 Page8of9 3.3 Testdata 3.3.2Typicalfreespaceefficiencyandgain 3.3.3Typicalfreespaceradiationpattern (1)X-ZPlane: (2)Y-ZPlane: Frequency/MHz 24002410242024302440245024602470248024902500 PeakGain/dBi -6.87-6.78-6.43-6.26-6.01-5.77-5.46-5.29-5.22-5.13-4.78 Efficiency/% 6.216.266.476.746.847.297.778.198.368.819.37 ReportNo.:RFI-LAB-RF-202211-KK30 QP030-E11 Page9of9 (3)X-YPlane: (4)TypicalFreeSpace3DRadiationPatternat2.45GHz: -------------------------------------------------End------------------------------------------------ （Thefollowingisblank）

Page 1 of 3 TEST SETUP PHOTOS 1.1. Photos of Radiation Emission Measurement Spurious Emission Test Setup (30MHz-1GHz) Page 2 of 3 Spurious Emission Test Setup (Above 1GHz) Page 3 of 3 1.2. Conducted Emission Test ----- The End -----