2BCP5KB-223WirelessKeyboard

1/1 US Agent for Service of ProcessLETTER OF ATTESTATION TO: Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 US Agent for Service of Process: Company Name: THREE STONES MEDIA LLC FRN: 0033401761 Contact Name: Sijie Zhang Address: 1200 Broadway St. APT 329, Los Angeles, CA90015 Telephone No: +1 267 909 3692 Email: [email protected] Applicant: Company name: CHENZO TECH LIMITED Product Description: Wireless Keyboard Grantee code: FCC ID: 2BCP5 2BCP5KB-223 FRN: 0034188649 Contact Name: Address: Nikita Zhang FLAT B5, 1/F MANNING IND, BLDG 116-118 HOW MING STREETKWUN TONG KL HK, China Telephone No: +8618682006127 Email: [email protected] [CHENZO TECH LIMITED] certifies that, as of the date of this filing of the application with the TCB, [THREE STONES MEDIA LLC] is our designated US agent for service of process for the above referenced FCC ID. [CHENZO TECH LIMITED] accepts to 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 equipment. [THREE STONES MEDIA LLC] accepts, as of the date of the filing of the application, the obligation of the designated US agent for service of process for the above reference FCC ID. The US Agent for Service of Process is aware of and agrees to comply with the requirements outlined in the FCC Equipment Authorization Program, Report and Order FCC 22-84, and clause § 2.911. The Applicantis aware of and agrees to comply with the requirements outlined in the FCC Equipment Authorization Program, Report and Order FCC 22-84, and clause § 2.911. 1/1 Date: 02/11/2023 Applicant’s Name: Nikita Zhang US Agent’s Name: Sijie Zhang Title: Manager Title: President Signature Signature

C5266091_X24_Ed.2 1/1 “AttestationStatements” TO: Officeof EngineeringTechnology FederalCommunicationsCommission 7435 OaklandMills Road Columbia,MD 21046 The Commissionadoptedrulesthatprohibitequipmentauthorizationfor “covered” telecommunicationsequipmentand videosurveillanceequipmentproducedby entitiesidentified on the Commission’s CoveredList 1 , whichis periodicallyupdated.See the CoveredList for more details.This AttestationStatementis to confirmthat we followthe Section2.911(d)(5)(i)-(ii) Applicant Companyname:CHENZOTECHLIMITED Granteecode:2BCP5 FCC ID:2BCP5KB-223 ContactName:Nikita Address:FLAT B5, 1/F MANNINGIND, BLDG116-118HOW MINGSTREETKWUN TONGKL HK, China TelephoneNo:+8618682006127 Fax No:N/A Email:[email protected] i.[CHENZOTECHLIMITED] (“theapplicant”) certifiesthattheequipmentfor whichauthorizationissoughtisnot“covered” equipmentprohibitedfrom receivinganequipmentauthorizationpursuanttosection2.903oftheFCC rules.Theapplicantmustsignthiscertification. ii.[CHENZOTECHLIMITED] (“theapplicant”) certifiesthat,asof thedateof the filingoftheapplication,theapplicantis not(asa specificallynamedentityor anyof itssubsidiariesoraffiliates)identifiedontheCoveredListasanentity producing“covered” equipment.Theapplicantmustsignthiscertification. CHENZOTECH LIMITEDcertifiesthat, as of the date of the filing of theapplication, the applicantis notidentifiedon the CoveredList as an entityproducing “covered”equipment. Date: 21/10/2023 Applicant’s Name: Nikita Zhang Title: Manager Signature 1 The Commission’s CoveredListis publishedby the PublicSafetyand HomelandSecurityBureauand postedon the Commission’s website.This CoveredList, whichis periodicallyupdated,identifiesparticularequipment,producedby particularentities,that constitutes“covered”equipment.https://www.fcc.gov/supplychain/coveredlist

CHENZOTECHLIMITED Familymodelsdeclarationletter. 10/21/2023 We Company:CHENZOTECH LIMITED Address:FLAT B5, 1/F MANNINGIND, BLDG116-118HOW MINGSTREETKWUNTONG KL HK, China Product:WirelessKeyboard Model Name:KB-223 FamilyModel:KB-223(W) All modelsare the same circuitand RF module,exceptthe Color. We (CHENZOTECHLIMITED) herebystate that all the modelsare electricalidenticalincluding the same softwareparameterand hardwaredesign(i.e., circuitdesign,PCB Layout,RF module/circuit,antennatype(s)and antennalocation,componentson PCB, etc.), same mechanical structureand design (includingproductenclosure,materials,etc.), the only differenceis the Color . Thanks Sincerely, Signature [Name] Nikita Zhang [Title] Manager [email protected]

C5266091_X8_Ed.1 1/1 Letterof Authorization < CHENZOTECHLIMITED> Company:CHENZOTECH LIMITED Address:FLAT B5, 1/F MANNINGIND, BLDG 116-118HOW MING STREETKWUNTONGKL HK, China ProductName:WirelessKeyboard ModelNumber:KB-223,KB-223(W) FCC Identifier:2BCP5KB-223 WeauthorizeLGAITechnologicalCenterS.A.,Rondadela FontdelCarme,s/n, 08193Bellaterra,Spain,toactonourbehalfonallmattersconcerningthe abovenamedequipment. AnyindividualwithinLGAITechnologicalCenterS.A.is authorizedto actonour behalfandtakeactionontheapplication. WedeclarethatauthorizeLGAITechnologicalCenterS.A.,Rondadela Fontdel Carme,s/n,08193Bellaterra,Spain,isallowedtoforwardallinformation relatedto theapprovalprojectto theFederalCommunicationCommissionand todiscussanyissuesconcerningtheapprovalapplication.Anyandallacts carriedoutbyLGAITechnologicalCenterS.A.onourbehalfshallhavethe sameeffectasactsof ourown. Name: Nikita ZhangDate: 21/10/2023 Title: Manager Signatureof applicant:

C5266091_X10_Ed.2 1/1 CHENZOTECHLIMITED Officeof EngineeringTechnology FederalCommunicationsCommission 7435 OaklandMills Road Columbia,MD 21046Date:21/10/2023 Subject:Requestfor Confidentiality FCC ID:2BCP5KB-223 To WhomIt May Concern, Pursuantto the provisionsof Sections0.457and 0.459of Commission'srules (47CFR0.457,0.459),we are requestingthe Commissionto withholdthe following attachment(s)as confidentialdocumentfrom publicdisclosure. ExhibitsLong-Term Confidentiality Short-Term Confidentiality NOTE2 ID Label/Location AttestationStatement ExternalPhotos Block Diagram Schematics Test Report Test SetupPhotos User’ s Manual NOTE 1 InternalPhotos NOTE 1 Parts List / Tune Up / BOM List RF ExposureInfo OperationalDescription CoverLetter(s) FCC SoftwareSecurity Requirementsfor UNII devices NOTE1: Long-TermConfidentialitymay be permittedunderspecialconditions(SeeII. LONG-TERMCONFIDENTIALITY,Section3 of KDB 726920,use last in force) NOTE2: Short-TermConfidentialitycan be requestedfor a maximumof 180 daysfromthe dateof the grant. Abovementioneddocumentcontainsdetailedsystemand equipmentdescriptionare consideredas proprietaryinformationin operationof the equipment.The public disclosureof abovedocumentsmightbe harmfulto our companyand wouldgive competitoran unfairadvantagein the market. In case of short-termConfidentiality,the applicantrequeststhe exhibitsselected aboveare withheldfrom publicview for a periodof _180 _ days from the date of the Grantof EquipmentAuthorizationand prior to marketing. C5266091_X10_Ed.2 1/1 It is our understandingthat all measurementtest reports,FCC ID label formatand correspondentduringcertificationreviewprocesscannotbe grantedas confidential documentsand thoseinformationwill be availablefor publicreviewonce the grantof equipmentauthorizationis issued. Sincerely, Signature: Name: Nikita Zhang Title: Manager

ATTACHMENT PHOTOGRAPHS OF EUT Photo 1 Photo 2 Photo 3 Photo 4 Photo 5 Photo 6 Photo 7 Photo 8 Photo 9

less 1.5V KB-123 Rating Label Material Adhesive3M 467 Size: 30x18.5mm Cosmetic: Rear side pringing Color Text: Pantone 8401C BackgroundPantone Black C 230417 条码需重新生成， 并与底部文字一致 OS1AE03010000 FCC ID : 2BCP5KB-223

ATTACHMENT PHOTOGRAPHS OF EUT Photo 1 Photo 2 Photo 3 Photo 4 Photo 5 Photo 6 ANT Photo 7

FCC ID: 2BCP5KB-223 Portable device According to §15.247(e)(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 SAR 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 When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion. Modulation Channel Freq. (GHz) Conduct ed power (dBm) Conducte d power (mW) Tune-up power (dBm) Max tune-up power (dBm) Max tune-up power (mW) Distance (mm) Result calculatio n SAR Exclusion threshold SAR test exclusion 2.408 -5.69 0.27-5±1 -4 0.40<50.123553.00YES 2.44 -4.8 0.33-5±1 -4 0.40<50.124373.00YES 2.474 -4.78 0.33-5±1 -4 0.40<50.125243.00YES GFSK Conclusion: For the max result : 0.12539 ≤ 3.0 for 1g SAR, SAR is not required. Signature: Date: 2023-11-03 NAME AND TITLE (Please print or type): Alex li /Manager COMPANY (Please print or type): Shenzhen NTEK Testing Technology Co., Ltd./ 1/F, Building E, Fenda Science Park, Sanwei Community, Xixiang Street Bao’an District, Shenzhen P.R. China.

ANTENNA SPECIFICATION Specifications Summary ITEMSPEC. Model Name Center HorizontalVertical 2408MHz 2440MHz 2478MHz 2408MHz 2440MHz 2478MHz Frequency -1.64-0.82-0.62-6.17 - 3 .64- 2 .23 MAX. Gain-0.62 PolarizationHorizontal and Vertical Azimuth Beam Omni-directional Pattern Impedance 50 Ohm Antenna Length 29.2mm Manufacture Mosart Semiconductor Corp Antenna Photo & Length (mm) Horizontal: 2408MHz2440MHz 2478MHz FrequencyGain(dBi) (MHz) Max.Min.Avg. 2408 -1.66181-30.2813-8.78713 2440 -0.847911-38.7595-7.87912 2478 -0.615608-23.64129-6.99219 (unit: dBi) Vertical: 2408MHz2440MHz 2478MHz FrequencyGain(dBi) (MHz) Max.Min.Avg. 2408 -6.1633-23.1325-12.5205 2440 -3.6601-26.2856-10.6689 2478 -2.21201-29.4281-9.58536 (unit: dBi)

Report No.: S22122601901001 Version.1.3 Page 1 of 59 RADIO TEST REPORT FCC ID: 2BCP5KB-223 Product: Wireless Keyboard Trade Mark: CHENZO Model No.: KB-223 Family Model: KB-223 (W) Report No.: S22122601901001 Issue Date: Feb 13, 2023 Prepared for CHENZO TECH LIMITED FLAT B5, 1/F MANNING IND, BLDG 116-118 HOW MING STREETKWUN TONG KL HK, China Prepared by Shenzhen NTEK Testing Technology Co., Ltd. 1/F, Building E, Fenda Science Park, Sanwei Community, Xixiang Street Bao’an District, Shenzhen 518126 P.R. China Tel. 400-800-6106, 0755-2320 0050, 0755-2320 0090 Website: http://www.ntek.org.cn Report No.: S22122601901001 Version.1.3 Page 2 of 59 TABLE OF CONTENTS 1 TEST RESULT CERTIFICATION ...................................................................................................................... 3 2 SUMMARY OF TEST RESULTS ......................................................................................................................... 4 3 FACILITIES AND ACCREDITATIONS ............................................................................................................. 5 3.1 FACILITIES..................................................................................................................................................... 5 3.2 LABORATORY ACCREDITATIONS AND LISTINGS ................................................................................. 5 3.3 MEASUREMENT UNCERTAINTY ............................................................................................................... 5 4 GENERAL DESCRIPTION OF EUT .................................................................................................................. 6 5 DESCRIPTION OF TEST MODES ..................................................................................................................... 8 6 SETUP OF EQUIPMENT UNDER TEST ........................................................................................................... 9 6.1 BLOCK DIAGRAM CONFIGURATION OF TEST SYSTEM ....................................................................... 9 6.2 SUPPORT EQUIPMENT ............................................................................................................................... 10 6.3 EQUIPMENTS LIST FOR ALL TEST ITEMS .............................................................................................. 11 7 TEST REQUIREMENTS .................................................................................................................................... 13 7.1 CONDUCTED EMISSIONS TEST ............................................................................................................... 13 7.2 RADIATED SPURIOUS EMISSION ............................................................................................................ 15 7.3 NUMBER OF HOPPING CHANNEL ........................................................................................................... 24 7.4 HOPPING CHANNEL SEPARATION MEASUREMENT ........................................................................... 25 7.5 AVERAGE TIME OF OCCUPANCY (DWELL TIME) ................................................................................ 26 7.6 20DB BANDWIDTH TEST .......................................................................................................................... 28 7.7 PEAK OUTPUT POWER .............................................................................................................................. 29 7.8 CONDUCTED BAND EDGE MEASUREMENT......................................................................................... 30 7.9 SPURIOUS RF CONDUCTED EMISSION .................................................................................................. 31 7.10 ANTENNA APPLICATION .......................................................................................................................... 32 7.11 FREQUENCY HOPPING SYSTEM (FHSS) EQUIPMENT REQUIREMENTS ......................................... 33 8 TEST RESULTS ................................................................................................................................................... 34 8.1 MAXIMUM CONDUCTED OUTPUT POWER ....................................................................................................... 34 8.2 -20DB BANDWIDTH ........................................................................................................................................ 37 8.3 OCCUPIED CHANNEL BANDWIDTH .................................................................................................................. 40 8.4 CARRIER FREQUENCIES SEPARATION .............................................................................................................. 43 8.5 NUMBER OF HOPPING CHANNEL ..................................................................................................................... 46 8.6 BAND EDGE .................................................................................................................................................... 48 8.7 BAND EDGE(HOPPING) ................................................................................................................................... 51 8.8 CONDUCTED RF SPURIOUS EMISSION ............................................................................................................. 54 8.9 DWELL TIME ................................................................................................................................................... 58 Report No.: S22122601901001 Version.1.3 Page 3 of 59 1 TEST RESULT CERTIFICATION Applicant’s name ........................ : CHENZO TECH LIMITED Address ....................................... : FLAT B5, 1/F MANNING IND, BLDG 116-118 HOW MING STREETKWUN TONG KL HK, China Manufacturer's Name ................. : SHENZHEN CHENZO TECH LIMITED Address ....................................... : 208E, 2F…

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Radiated Measurement Photos