2AMNT-KS421-STLKeySmart Max with Tile Smart Location

FCC Warning

C5266091_X8_Ed.1 1/1 LetterofAuthorization CurvGroupLLC Company:CurvGroupLLC Address:860BonnieLn,ElkGroveVillage,IL60007,USA ProductName:KeySmartMaxwithTileSmartLocation ModelNumber:KS421-STL FCCIdentifier: 2AMNT-KS421-STL WeauthorizeLGAITechnologicalCenterS.A.,RondadelaFontdelCarme,s/n, 08193Bellaterra,Spain,toactonourbehalfonallmattersconcerningthe abovenamedequipment. AnyindividualwithinLGAITechnologicalCenterS.A.isauthorizedtoactonour behalfandtakeactionontheapplication. WedeclarethatauthorizeLGAITechnologicalCenterS.A.,RondadelaFontdel Carme,s/n,08193Bellaterra,Spain,isallowedtoforwardallinformation relatedtotheapprovalprojecttotheFederalCommunicationCommissionand todiscussanyissuesconcerningtheapprovalapplication.Anyandallacts carriedoutbyLGAITechnologicalCenterS.A.onourbehalfshallhavethe sameeffectasactsofourown. Name:MichaelMike Date:10/14/2020 Title:Manager Signatureofapplicant:

C5266091_X10_Ed.1 1/1 CurvGroupLLC OfficeofEngineeringTechnology FederalCommunicationsCommission 7435OaklandMillsRoad Columbia,MD21046 Date:10/14/2020 Subject:RequestforConfidentiality FCCID:2AMNT-KS421-STL ToWhomItMayConcern, PursuanttotheprovisionsofSections0.457and0.459ofCommission'srules (47CFR0.457,0.459),wearerequestingtheCommissiontowithholdthefollowing attachment(s)asconfidentialdocumentfrompublicdisclosure. ExhibitsLong-Term Confidentiality Short-Term Confidentiality IDLabel/LocationNoNo AttestationStatementNoNo ExternalPhotosNo BlockDiagram Schematics TestReportNoNo TestSetupPhotosNo User’sManual InternalPhotos PartsList/TuneUp RFExposureInfo OperationalDescription CoverLetter(s)NoNo SDRSoftware/SecurityInfoNo Abovementioneddocumentcontainsdetailedsystemandequipmentdescriptionare consideredasproprietaryinformationinoperationoftheequipment.Thepublic disclosureofabovedocumentsmightbeharmfultoourcompanyandwouldgive competitoranunfairadvantageinthemarket. Itisourunderstandingthatallmeasurementtestreports,FCCIDlabelformatand correspondentduringcertificationreviewprocesscannotbegrantedasconfidential documentsandthoseinformationwillbeavailableforpublicreviewoncethegrantof equipmentauthorizationisissued. Sincerely, Signature: Name:MichaelMikeDate:10/14/2020 Title:Manager

1 - Page 1 of 6 - Report No.: MTi20091604-8E1 -1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. APPENDIX 1: EUT PHOTO Photo 1 (For model KS421-STL) Photo 2 1 - Page 2 of 6 - Report No.: MTi20091604-8E1 -1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. Photo 3 Photo 4 1 - Page 3 of 6 - Report No.: MTi20091604-8E1 -1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. Photo 5 Photo 6 1 - Page 4 of 6 - Report No.: MTi20091604-8E1 -1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. Photo 7 Photo 8 1 - Page 5 of 6 - Report No.: MTi20091604-8E1 -1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. Photo 9 Photo 10 1 - Page 6 of 6 - Report No.: MTi20091604-8E1 -1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. Photo 11 ----END OF REPORT----

Pad Print Scale 1:1 Pantone Cool Grey 1CPantone Cool Grey 1CPantone Cool Grey 1C 17.0 mm Pad Print Scale 1:1 2.965 mm Pad Print Scale 1:1 53.80 mm 3.4 mm 3.54 mm 7.2 mm 2.65 mm Front View Scale 1:1 Center Front View Scale 1:1 rev page PRODUCT: SEASON: 2020 X4 1 CurvGroup / Keysmart Pro 2.0 - Artwork X3 KeySmart Pro 2.0 Proprietary information. This drawing contains information proprietary to STEL. Any reproduction, disclosure, or transmittal of this information without written consent is prohibited by law. Internal View Scale 1:1 Center 6.97 mm 6.97 mm KS421-STL 214- KS421-STL 214-

1 - Page 1 of 3 - Report No.: MTi20091604-8E1 -1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. APPENDIX 1: EUT PHOTO Photo 1 (For model KS421-STL) Photo 2 1 - Page 2 of 3 - Report No.: MTi20091604-8E1 -1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. Photo 3 Photo 4 PCB Antenna 1 - Page 3 of 3 - Report No.: MTi20091604-8E1 -1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. Photo 5 ----END OF REPORT----

This test report is valid for the tested samples only. It cannot be reproduced except in full without prior written consent of Shenzhen Microtest Co., Ltd. Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. RF EXPOSURE REPORT FCC ID: 2AMNT-KS421-STL Date of issue: Sept. 30, 2020 Report Number: MTi20091604-8E2 Sample Description: KeySmart Max with Tile Smart Location Mo d e l( s ) : KS421-STL Applicant: Curv Group LLC Address: 860 Bonnie Ln, Elk Grove Village, IL 60007, USA Date of Test: Sept. 22, 2020 to Sept. 30, 2020 Shenzhen Microtest Co., Ltd. http://www.mtitest.com - Page 2 of 4- Report No.: MTi20091604-8E2 TEST RESULT CERTIFICATION Applicant’s name: Curv Group LLC Address: 860 Bonnie Ln, Elk Grove Village, IL 60007, USA Manufacture's name: Shenzhen Xinzhensheng Electronics Co., Ltd. Address: 2 3/F, 8 Building, No.161, Workshop, Xingye 1st Road, Fenghuang Community, Fuyong Street, Bao'an District, Shenzhen City, Guangdong Province, P.R. China. Product name: KeySmart Max with Tile Smart Location Model and/or type reference: KS421-STL Serial Model: N/A RF Exposure Procedures: KDB 447498 D01 v06 This device described above has been tested by Shenzhen Microtest Co., Ltd and the test results show that the equipment under test (EUT) is in compliance with the FCC requirements. And it is applicable only to the tested sample identified in the report. Tested by: Demi Mu Sept. 30, 2020 Reviewed by: Leo Su Sept. 30, 2020 Approved by: Tom Xue Sept. 30, 2020 - Page 3 of 4- Report No.: MTi20091604-8E2 1. Standalone SAR test exclusion considerations Unless specifically required by the published RF exposure KDB procedures, standalone 1-g head or body and 10-g extremity SAR evaluation for general population exposure conditions, by measurement or numerical simulation, is not required when the corresponding SAR Test Exclusion Threshold condition(s), listed below, is (are) satisfied. These test exclusion conditions are based on source-based time-averaged maximum conducted output power of the RF channel requiring evaluation, adjusted for tune-up tolerance, and the minimum test separation distance required for the exposure conditions. The minimum test separation distance defined in 4.1 f) is determined by the smallest distance from the antenna and radiating structures or outer surface of the device, according to the host form factor, exposure conditions and platform requirements, to any part of the body or extremity of a user or bystander. To qualify for SAR test exclusion, the test separation distances applied must be fully explained and justified, typically in the SAR measurement or SAR analysis report, by the operating configurations and exposure conditions of the transmitter and applicable host platform requirements, according to the required published RF exposure KDB procedures. When no other RF exposure testing or reporting are required, a statement of justification and compliance must be included in the equipment approval, in lieu of the SAR report, to qualify for SAR test exclusion. When required, the device specific conditions described in the other published RF exposure KDB procedures must be satisfied before applying these SAR test exclusion provisions. a) For 100 MHz to 6 GHz and test separation distances ≤ 50 mm, the 1-g and 10-g SAR test exclusion thresholds are determined by the following: [(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 values 3.0 and 7.5 are referred to as numeric thresholds in step b) below 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 according to 4.1 f) is applied to determine SAR test exclusion. b) For 100 MHz to 6 GHz and test separation distances > 50 mm, the 1-g and 10-g SAR test exclusion thresholds are determined by the following (also illustrated in Appendix B): 1) {[Power allowed at numeric threshold for 50 mm in step a)] + [(test separation distance – 50 mm)·(f(MHz)/150)]} mW, for 100 MHz to 1500 MHz 2) {[Power allowed at numeric threshold for 50 mm in step a)] + [(test separation distance – 50 mm)·10]} mW, for > 1500 MHz and ≤ 6 GHz c) For frequencies below 100 MHz, the following may be considered for SAR test exclusion (also illustrated in Appendix C): 1) For test separation distances > 50 mm and < 200 mm, the power threshold at the corresponding test separation distance at 100 MHz in step b) is multiplied by [1 + log(100/f(MHz))] 2) For test separation distances ≤ 50 mm, the power threshold determined by the equation in c) 1) for 50 mm and 100 MHz is multiplied by ½ 3) SAR measurement procedures are not established below 100 MHz. - Page 4 of 4- Report No.: MTi20091604-8E2 When SAR test exclusion cannot be applied, a KDB inquiry is required to determine SAR evaluation requirements for any SAR test results below 100 MHz to be acceptable. 2. SAR Test Exclucsion Thresholds Bluetooth DTS: Transmit Frequenc y (GHz) Mode Measured Power (dBm) Tune-up power (dBm) Max tune- up Result 1g SAR power(dBm) calculation 2.402 GFSK -1.445 -1±1 0 0.3100 3 2.440 -1.364 -1±1 0 0.3124 3 2.480 -1.272 -1±1 0 0.3150 3 Conclusion: For the max result: 0.3150≤ 3.0 for 1g SAR, No SAR is required. ----END OF REPORT----

This test report is valid for the tested samples only. It cannot be reproduced except in full without prior written consent of Shenzhen Microtest Co., Ltd. Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. Test Report FCC ID: 2AMNT-KS421-STL Date of issue: Sept. 30, 2020 Report number: MTi20091604-8E1 Sample description: KeySmart Max with Tile Smart Location Mo d e l( s ) : KS421-STL Applicant: Curv Group LLC Address: 860 Bonnie Ln, Elk Grove Village, IL 60007, USA Date of test: Sept. 22, 2020 to Sept. 30, 2020 Shenzhen Microtest Co., Ltd. http://www.mtitest.com - Page 2 of 45 - Report No.: MTi20091604-8E1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. Table of Contents 1. GENERAL INFORMATION ................................................................................................................................... 5 1.1. DESCRIPTION OF EUT ................................................................................................................................................... 5 1.2. OPERATION CHANNEL LIST .............................................................................................................................................. 5 1.3. TEST CHANNEL LIST ....................................................................................................................................................... 6 1.4. ANCILLARY EQUIPMENT LIST ........................................................................................................................................... 6 1.5. DESCRIPTION OF SUPPORT UNITS .................................................................................................................................... 6 2. SUMMARY OF TEST RESULTS .......................................................................................................................... 7 3. TEST FACILITIES AND ACCREDITATIONS ...................................................................................................... 8 3.1. TEST LABORATORY ........................................................................................................................................................ 8 3.2. ENVIRONMENTAL CONDITIONS ........................................................................................................................................ 8 3.3. MEASUREMENT UNCERTAINTY ........................................................................................................................................ 8 3.4. TEST SOFTWARE ........................................................................................................................................................... 8 4. EQUIPMENT LIST ................................................................................................................................................. 9 5. TEST RESULT ..................................................................................................................................................... 10 5.1. ANTENNA REQUIREMENT ............................................................................................................................................. 10 5.1.1 Standard Requirement ...................................................................................................................................... 10 5.1.2 EUT Antenna ..................................................................................................................................................... 10 5.2. PEAK OUTPUT POWER TEST ......................................................................................................................................... 11 5.2.1 Limit .................................................................................................................................................................. 11 5.2.2 Test setup .......................................................................................................................................................... 11 5.2.3 Test Procedure ................................................................................................................................................... 11 5.2.4 Test Results ........................................................................................................................................................ 11 5.3. CONDUCTED EMISSION ................................................................................................................................................ 14 5.3.1 Limits ................................................................................................................................................................. 14 5.3.2 Test Setup .......................................................................................................................................................... 14 5.3.3 Test Procedure ................................................................................................................................................... 15 5.3.4 Test Results ........................................................................................................................................................ 15 5.4. RADIATED SPURIOUS EMISSION ...................................................................................................................................... 20 5.4.1 Limits ................................................................................................................................................................. 20 5.4.…

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Model: KS421-STL Radiated emission Conducted emission