2AQLGHINGE3Wearable Motion Tracking Sensors

INSTRUCTION TO THE USER This equipment has been tested and found to comply with the limits for a class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: * Reorient or relocate the receiving antenna. * Increase the separation between the equipment and receiver. * Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. * Consult the dealer or an experienced radio/TV technician for help. In order to maintain compliance with FCC regulations, shielded cables must be used with this equipment. Operation with non-approved equipment or unshielded cables is likely to result in interference to radio and TV reception. The user is cautioned that changes and modifications made to the equipment without the approval of manufacturer could void the user's authority to operate this equipment.

12/16/2020 Federal Communications Commission 45 L Street NE Washington, DC 20554 To whom it may concern: This is a letter of authorization to accept David Doucette of Hinge Health, to sign documentation on our behalf, to make representations on our behalf, and to receive and exchange data in connection with certification of the following Hinge Health product: Wearable motion tracking sensors FCC ID: 2AQLGHINGE3 If you have any further questions or need additional information, please feel free to give me a call at +44 7827 912 961. Sincerely, Simon Hunter Product Director, Hinge Health 465 California St., 14th Floor San Francisco, CA 94104

Top View of the EUT Bottom View of the EUT Side View #1 of the EUT Side View #2 of the EUT Side View #3 of the EUT Side View #4 of the EUT

Inside View of the EUT Top View of the PCB Closeup of the PCB Showing L1 populated Top View of the PCB - #3 Bottom View of the PCB - View #1 Bottom View of the PCB - View #2 Bottom View of the PCB - View #3

Compatible Electronics, Inc.https://celectronics.com 114 Olinda Drive Brea, CA 92823 This device FCC ID: Prepared By: Date: The maximum power that the transmitter is capable of is 0.27 mW Applied duty cycle? no Using the following formula from section 4.3.1 of KDB 447498 at test separation distances ≤ 50 mm [(max. power of channel, including tune-up tolerance, mW) / (min. test separation distance, mm)] * [ √ f(GHz)] Duty Cycle 50.00% Value 1-g (mW) 10-g (mW) 0.08 (353) -208 "Value" shall be ≤ 3.0 for 1-g SAR and ≤ 7.5 for 10-g extremity SAR 1-g power limit 10-g power limit 97 242 “source-based” time-averaging based on an inherent property or duty-cycle of a device is allowed. An example of this is the determination of exposure from a device that uses digital technology such as a time-division multiple-access (TDMA) scheme for transmission of a 2AQLGHINGE3 Max Peak Power (dBm) Min Separation distance (mm) * Frequency (Ghz) < 50mm power limits for above frequency and distance When the minimum test separation distance is < 5 mm, a distance of 5 mm according to 5) in section 4.1 is applied to determine SAR test exclusion. 2.402 5 -5.71 Kyle Fujimoto 6-Jan-21 SAREXJUST-B-0-43 D 02/27/2020

Report Number: B00728D1 FCC Part 15 Subpart B and C; FCC Section 15.249; and RSS-210 & RSS-Gen Test Report Hinge Sensor Model: H3 Brea Division 114 Olinda Drive Brea, CA 92823 (714) 579-0500 Newbury Park Division 1050 Lawrence Drive Newbury Park, CA 91320 (805) 480-4044 Lake Forest Division 20621 Pascal Way Lake Forest, CA 92630 (949) 587-0400 Page 1 of 24 FCC PART 15, SUBPART B and C; FCC Section 15.249; and RSS-210 & RSS-GEN TEST REPORT for HINGE SENSOR Model: H3 Prepared for HINGE HEALTH, INC. 465 CALIFORNIA STREET, FLOOR 14 SAN FRANCISCO, CALIFORNIA 94104 Prepared by:_____________________ KYLE FUJIMOTO Approved by:____________________ JAMES ROSS COMPATIBLE ELECTRONICS INC. 114 OLINDA DRIVE BREA, CALIFORNIA 92823 (714) 579-0500 JANUARY 28, 2020 REPORT APPENDICES TOTAL BODY A B C D E PAGES 24 2 2 2 19 48 97 This report shall not be reproduced except in full, without the written approval of Compatible Electronics. Report Number: B00728D1 FCC Part 15 Subpart B and C; FCC Section 15.249; and RSS-210 & RSS-Gen Test Report Hinge Sensor Model: H3 Brea Division 114 Olinda Drive Brea, CA 92823 (714) 579-0500 Newbury Park Division 1050 Lawrence Drive Newbury Park, CA 91320 (805) 480-4044 Lake Forest Division 20621 Pascal Way Lake Forest, CA 92630 (949) 587-0400 Page 2 of 24 TABLE OF CONTENTS Section / Title PAGE GENERAL REPORT SUMMARY 4 SUMMARY OF TEST RESULTS 5 1. PURPOSE 6 1.1 Decision Rule & Risk 7 2. ADMINISTRATIVE DATA 8 2.1 Location of Testing 8 2.2 Traceability Statement 8 2.3 Cognizant Personnel 8 2.4 Date Test Sample was Received 8 2.5 Disposition of the Test Sample 8 2.6 Abbreviations and Acronyms 8 3. APPLICABLE DOCUMENTS 9 4. DESCRIPTION OF TEST CONFIGURATION 10 4.1 Description of Test Configuration – Emissions 10 4.1.1 Cable Construction and Termination 11 5. LISTS OF EUT, ACCESSORIES AND TEST EQUIPMENT 12 5.1 EUT and Accessory List 12 5.2 Emissions Test Equipment 13 6. TEST SITE DESCRIPTION 14 6.1 Test Facility Description 14 6.2 EUT Mounting, Bonding and Grounding 14 6.3 Measurement Uncertainty 15 7. TEST PROCEDURES 16 7.1 RF Emissions 16 7.1.1 Conducted Emissions Test 16 7.1.2 Radiated Emissions Test 17 7.1.3 RF Emissions Test Results 18 7.1.4 Sample Calculations 20 7.2 99% Bandwidth 22 7.3 Variation of the Input Power 22 7.4 Duty Cycle Calculation 23 8. CONCLUSIONS 24 Report Number: B00728D1 FCC Part 15 Subpart B and C; FCC Section 15.249; and RSS-210 & RSS-Gen Test Report Hinge Sensor Model: H3 Brea Division 114 Olinda Drive Brea, CA 92823 (714) 579-0500 Newbury Park Division 1050 Lawrence Drive Newbury Park, CA 91320 (805) 480-4044 Lake Forest Division 20621 Pascal Way Lake Forest, CA 92630 (949) 587-0400 Page 3 of 24 LIST OF APPENDICES APPENDIX TITLE A Laboratory Accreditations and Recognitions B Modifications to the EUT C Additional Models Covered Under This Report D Diagrams and Charts  Test Setup Diagrams  Antenna and Effective Gain Factors E Data Sheets F Class I Permissive Change Information LIST OF FIGURES FIGURE TITLE 1 Conducted Emissions Test Setup 2 Layout of the Semi-Anechoic Test Chamber LIST OF TABLES TABLE TITLE 1 Radiated Emission Results Report Number: B00728D1 FCC Part 15 Subpart B and C; FCC Section 15.249; and RSS-210 & RSS-Gen Test Report Hinge Sensor Model: H3 Brea Division 114 Olinda Drive Brea, CA 92823 (714) 579-0500 Newbury Park Division 1050 Lawrence Drive Newbury Park, CA 91320 (805) 480-4044 Lake Forest Division 20621 Pascal Way Lake Forest, CA 92630 (949) 587-0400 Page 4 of 24 GENERAL REPORT SUMMARY This electromagnetic emission test report is generated by Compatible Electronics Inc., which is an independent testing and consulting firm. The test report is based on testing performed by Compatible Electronics personnel according to the measurement procedures described in the test specifications given below and in the "Test Procedures" section of this report. The measurement data and conclusions appearing herein relate only to the sample tested and this report may not be reproduced without the written permission of Compatible Electronics, unless done so in full. The client must not use this report to claim product certification, approval or endorsement by NVLAP, NIST or any agency of the U.S. government. Device Tested: Hinge Sensor Model: H3 S/N: N/A Product Description: The EUT is a wearable sensor that utilizes a BLE Radio. Modifications: The EUT was not modified to meet the specifications. Customer: Hinge Health, Inc. 456 California Street, Floor 14 San Francisco, California 94104 Test Dates: July 27, 2020; July 28, 2020; July 29, 2020; and December 18, 2020 Test Specifications covered by accreditation: Test Specifications : Emissions requirements CFR Title 47, Part 15, Subpart B; CFR Title 47, Part 15, Subpart C, Sections 15.209 and 15.249; and RSS-210 and RSS-Gen Test Procedures: ANSI C63.4: 2014 and ANSI C63.10: 2013 Test Deviations: The test procedure was not deviated from during the testing. Report Number: B00728D1 FCC Part 15 Subpart B and C; FCC Section 15.249; and RSS-210 & RSS-Gen Test Report Hinge Sensor Model: H3 Brea Division 114 Olinda Drive Brea, CA 92823 (714) 579-0500 Newbury Park Division 1050 Lawrence Drive Newbury Park, CA 91320 (805) 480-4044 Lake Forest Division 20621 Pascal Way Lake Forest, CA 92630 (949) 587-0400 Page 5 of 24 SUMMARY OF TEST RESULTS TEST DESCRIPTION RESULTS 1 Conducted RF Emissions, 150 kHz – 30 MHz The EUT complies with the limits of CFR Title 47, Part 15 Subpart B, Section 15.107, Class B; CFR Title 47, Part 15, Subpart C, Sections 15.207; and RSS-Gen See section 6.3 for Measurement Uncertainty 2 Spurious Radiated RF Emissions, 30 MHz – 1000 MHz The EUT complies with the limits of CFR Title 47, Part 15 Subpart B, Section 15.109, Class B; CFR Title 47, Part 15, Subpart C, Sections 15.209 and 15.249;and RSS-210 and RSS-Gen See section 6.3 for Measurement Uncertainty 3 Spurious Radiated RF Emissions, 9 kHz –30 MHz and 1000 MHz – 25000 MHz The EUT complies with the limits of CFR Title 47, Part 15, Subpart B…

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FRONT VIEW HINGE HEALTH, INC. HINGE SENSOR MODEL: H3 FCC SUBPART B AND C; RSS-210 AND RSS-GEN RADIATED EMISSIONS – BATTERY MODE – BELOW 1 GHz PHOTOGRAPH SHOWING THE EUT CONFIGURATION FOR MAXIMUM EMISSIONS REAR VIEW HINGE HEALTH, INC. HINGE SENSOR MODEL: H3 FCC SUBPART B AND C; RSS-210 AND RSS-GEN RADIATED EMISSIONS – BATTERY MODE – BELOW 1 GHz PHOTOGRAPH SHOWING THE EUT CONFIGURATION FOR MAXIMUM EMISSIONS FRONT VIEW HINGE HEALTH, INC. HINGE SENSOR MODEL: H3 FCC SUBPART B AND C; RSS-210 AND RSS-GEN RADIATED EMISSIONS – BATTERY MODE – ABOVE 1 GHz PHOTOGRAPH SHOWING THE EUT CONFIGURATION FOR MAXIMUM EMISSIONS REAR VIEW HINGE HEALTH, INC. HINGE SENSOR MODEL: H3 FCC SUBPART B AND C; RSS-210 AND RSS-GEN RADIATED EMISSIONS – BATTERY MODE – ABOVE 1 GHz PHOTOGRAPH SHOWING THE EUT CONFIGURATION FOR MAXIMUM EMISSIONS FRONT VIEW HINGE HEALTH, INC. HINGE SENSOR MODEL: H3 FCC SUBPART B AND C; RSS-210 AND RSS-GEN RADIATED EMISSIONS – AC MODE – BELOW 1 GHz PHOTOGRAPH SHOWING THE EUT CONFIGURATION FOR MAXIMUM EMISSIONS REAR VIEW HINGE HEALTH, INC. HINGE SENSOR MODEL: H3 FCC SUBPART B AND C; RSS-210 AND RSS-GEN RADIATED EMISSIONS – AC MODE – BELOW 1 GHz PHOTOGRAPH SHOWING THE EUT CONFIGURATION FOR MAXIMUM EMISSIONS FRONT VIEW HINGE HEALTH, INC. HINGE SENSOR MODEL: H3 FCC SUBPART B AND C; RSS-210 AND RSS-GEN RADIATED EMISSIONS – AC MODE – ABOVE 1 GHz PHOTOGRAPH SHOWING THE EUT CONFIGURATION FOR MAXIMUM EMISSIONS REAR VIEW HINGE HEALTH, INC. HINGE SENSOR MODEL: H3 FCC SUBPART B AND C; RSS-210 AND RSS-GEN RADIATED EMISSIONS – AC MODE – ABOVE 1 GHz PHOTOGRAPH SHOWING THE EUT CONFIGURATION FOR MAXIMUM EMISSIONS FRONT VIEW HINGE HEALTH, INC. HINGE SENSOR MODEL: H3 FCC SUBPART B AND C; AND RSS-GEN CONDUCTED EMISSIONS – AC MODE PHOTOGRAPH SHOWING THE EUT CONFIGURATION FOR MAXIMUM EMISSIONS REAR VIEW HINGE HEALTH, INC. HINGE SENSOR MODEL: H3 FCC SUBPART B AND C; AND RSS-GEN CONDUCTED EMISSIONS – AC MODE PHOTOGRAPH SHOWING THE EUT CONFIGURATION FOR MAXIMUM EMISSIONS