2AVGK-KXLRXRemote Receiver PCBA, ETR

Manual Introduction This module is installed inside the KXL System equipment to receive signals from the remote control. The KXL System is an electronic medical device which delivers ultraviolet light (365 nm wavelength) in a circular pattern onto the cornea after a solution of Riboflavin has been applied. Irradiating the Riboflavin creates singlet oxygen, which forms intermolecular bonds in corneal collagen, stiffening the cornea through cross-linking. UV flux and irradiation time (that is, fluence) at the cornea are controlled by an onboard computer system. Model : KXL-1B Receiver PCBA Description : RF remote receiver Applicant : Avedro Manufacturer Factory : Hyun seung i&c Co. LTD RF IC : Nordic semiconductor NRF52810 Communication with KXL system through USB connector (Micro B type). Input rated : 3.3Vdc Size : 25.0 X 25.0 [mm] , 1.6T Rx KXL System 2.4GHz I2C Receiver module KXL-1B Receiver PCBA is Used only in KHL System. FCC Compliance Notice FCC ID = 2AVGK-KXLRX 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 environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, 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 electrical outlet on a circuit different from that to which the receiver is connected. • Consult the dealer or an experienced radio/TV technician for help. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Caution: Any changes or modifications to this device not expressly approved by the party responsible for compliance could void your authority to operate the equipment. This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator and your body. Information on test modes and additional testing requirements a) The modular transmitter has been fully tested by the module grantee on the required number of channels,modulation types and modes, it should not be necessary for the host installer to re-test all the available transmitter modes or settings.It is recommended that the host product manufacturer installing the modular transmitter,perform some investigative measurements to confirm that the resulting composite system does not exceed the spurious emissions limits or band edge limits(e.g.,where a different antenna may be causing additional emissions). b) The testing should check for emissions that may occur due to the intermixing of emissions with the other transmitter, digital circuitry,or due to physical properties of the host product(enclosure). This investigation is especially important when integrating multiple modular transmitters where the certification is based on testing each of them in a stand-alone configuration. It is important to note that host product manufactures should not assume that because the modular transmitter is certified that they do not have any responsibility for final product compliance. c) If the investigation indicates acompliance concern the host product manufacture is obligated to mitigate the issue. Host products using a modular transmitter are subject to all the applicable individual technical rules as well as to the general conditions of operation in Sections 15.5,15.15,and 15.29 to not cause interference. The operator of the host product will be obligated to stop operating the device until the interference has been corrected. Additional testing, Part 15 subpart B disclaimer The final host/module combination need to be evaluated against the FCC Part 15B criteria for unintentional radiators in order to be properly authorized for operation as a Part 15 digital device.The host integrator installing this module into their product must ensure that the final composite product complies with the FCC requirements by a technical assessment or evaluation to the FCC rules, including the transmitter operation and should refer to guidance in KDB 996369. This appliance and its antenna must not be co-located or operation in conjunction with any other antenna or transmitter. - OEM integrators must ensure that its product is electrically identical to the device, FCC ID: 2AVGK-KXLRX reference designs. Any modifications to module reference designs may invalidate regulatory approvals in relation to the product, or may necessitate notifications to the relevant regulatory authorities. - OEM integrators are responsible for regression testing to accommodate changes to designs, new antennas, and host and submit for C2PC filings. - Colocation with other transmitter modules will be addressed through filings for those co-located transmitters when necessary or that colocation of other transmitters will be according to applicable KDB guidelines including those for RF exposure - Appropriate labels must be affixed to the product that complies with applicable regulations in all respects. The regulatory label on the final system must include the statement: “Contains FCC ID: 2AVGK-KXLRX”.

Avedro 201 Jones Road 5th floor, Waltham, MA, 02451, United States Date: June 23, 2019 Federal Communications Commission 7435 Oakland Mills Road Columbia MD 21046 To whom it may concern: I, the undersigned, hereby authorize Young-Jin, Lee of KES Co., Ltd. and hereafter referred to as KES Co., Ltd., to act on our behalf in all manners relating to application for equipment authorization, including signing of all documents relating to these matters. Any and all acts carried out by Young-Jin, Lee of KES Co., Ltd. on our behalf shall have the same effect as acts of our own. I, the undersigned, hereby certify that we are not subject to a denial of federal benefits, that includes FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. 853(a). In authorizing KES Co., Ltd. as our agent, we still recognize that we are responsible to: a) comply with the relevant provisions of the certification program; b) make all necessary arrangements for the conduct of the evaluation, including provision for examining documentation and access to all areas, records (including internal audit reports) and personnel for the purposes of evaluation (e.g. testing, inspection, assessment, surveillance, reassessment) and resolution of complaints; c) make claims regarding certification only in respect of the scope for which certification has been granted; d) do not use our product certification in such a manner as to bring the Certification Division into disrepute and not make any statement regarding our product certification which the Certification Division may consider misleading or unauthorized; e) upon suspension or cancellation of certification, discontinue use of all advertising matter that contains any reference thereto and return any certification documents as required by the Certification Division; f) use certification only to indicate the products are certified as being in conformity with specified standards; g) endeavor to ensure that no certificate or report nor any part thereof is used in a misleading manner; h) ensure that any reference to our product certification in communication media such as documents, brochures or advertising, complies with the requirements of the Certification Division; Avedro 201 Jones Road 5th floor, Waltham, MA, 02451, United States i) keep a record of all complaints made known to the us relating to the product’s compliance with requirements of the relevant standard and to make these records available to the Certification Division when requested; j) take appropriate action with respect to such complaints and any deficiencies found in products or services that affect compliance with the requirements for certification; k) document the actions taken. This authorization is valid until further written notice from the applicant. Sincerely Yours, Mr Jeffrey M Cross / Program Manager Avedro REMARK: 1. This authorization letter will be sent along with your application when filing with the Certification Division. 2. Please follow the format and type it on company letterhead and send original to us. 3. Authorized signature must be in agreement with grantee code contact in FCC database.

External photos FCC ID: 2AVG K-KXLRX Page 1 of 1

FCC Label and Location FCC Label and Location * Label The device is so small that it is not practicable to place the statement specified under 15.19 statement request and FCC ID can’t be on a single line, This label will be used and also the information required by this paragraph shall be placed in a Prominent location in the User’s Manual. *Label Position Revision No : 1.0 Page: 1 of 1

Internal photos Chip Antenna FCC ID: 2AVG K-KXLRX Page 1 of 1

RF exposure According to FCC part 1.1310 : The criteria listed in the following table shall be used to evaluate the environment impact of human exposure to radio frequency (RF) radiation as specified in § 1.1307(b) Limits for Maximum Permissible Exposure (MPE) f= frequency in ㎒ Friis transmission formula: Pd = (Pout×G)/(4×pi×R 2 ) Where, Pd = power density in ㎽/㎠ Pout = output power to antenna in ㎽ G = gain of antenna in linear scale Pi = 3.1416 R = distance between observation point and center of the radiator in cm Pd the limit of MPE, 1 ㎽/㎠. If we know the maximum gain of the antenna and the total power input to the antenna, through the calculation, we will know the distance where the MPE limit is reached. Results (Worst case) Mode Max tune-up power (㏈m) Antenna gain (㏈i) Power density at 20 ㎝(㎽/㎠) Limit (㎽/㎠) BLE -7 0.80 0.000 05 1 Frequency range (㎒) Electric field strength(V/m) Magnetic field strength (A/m) Power density (㎽/㎠) Average time (A) Limits for Occupational / Control Exposures 300 – 1 500 -- -- f/300 6 1 500 - 100000 -- -- 5 6 (B) Limits for General Population / Uncontrol Exposures 300 – 1 500 -- -- f/1500 6 1 500 – 100 000 -- -- 1 30 FCC ID: 2AVG K-KXLRX Page 1 of 1

KES Co., Ltd. 3701, 40, Simin-daero 365beon-gil, Dongan-gu, Anyang-si, Gyeonggi-do, 14057, Korea Tel : + 8 2-31-425-6200 / Fax: +82-31 -424-0450 www.kes.co.kr Report No.: KES-RF-20T0111 Page (2 ) of (31) Revision history Revision Date of issue Test report No. Description - 2020.07.03 KES-RF-20T0111 Initial This report shall not be reproduced except in full, without the written approval of KES Co., Ltd. The results shown in this test report refer only to the sample(s) tested unless otherwise stated. The authenticity of the test report, contact [email protected] KES-QP-7081-06 Rev. 7 KES A4 KES Co., Ltd. 3701, 40, Simin-daero 365beon-gil, Dongan-gu, Anyang-si, Gyeonggi-do, 14057, Korea Tel : + 8 2-31-425-6200 / Fax: +82-31 -424-0450 www.kes.co.kr Report No.: KES-RF-20T0111 Page (3 ) of (31) TABLE OF CONTENTS 1. General information ................................................................................................................................................... 4 1.1. EUT description ........................................................................................................................................ 4 1.2. Test configuration ...................................................................................................................................... 4 1.3. Device modifications ................................................................................................................................. 4 1.4. Frequency/channel operations ................................................................................................................... 4 1.5. Accessory information............................................................................................................................... 5 1.6. Software and Firmware description ........................................................................................................... 5 1.7. Measurement results explanation example ................................................................................................ 5 1.8. Measurement Uncertainty ......................................................................................................................... 5 2. Summary of tests ........................................................................................................................................................ 6 3. Test results .................................................................................................................................................................. 7 3.1. 6 ㏈ bandwidth ........................................................................................................................................ 7 3.2. Output power ............................................................................................................................................. 9 3.3. Power spectral density ............................................................................................................................. 11 3.4. Radiated restricted band and emissions ................................................................................................... 13 3.5 Conducted spurious emissions & band edge ........................................................................................... 26 3.6. AC conducted emissions ......................................................................................................................... 28 Appendix A. Measurement equipment ......................................................................................................................... 30 Appendix B. Test setup photos ..................................................................................................................................... 31 This report shall not be reproduced except in full, without the written approval of KES Co., Ltd. The results shown in this test report refer only to the sample(s) tested unless otherwise stated. The authenticity of the test report, contact [email protected] KES-QP-7081-06 Rev. 7 KES A4 KES Co., Ltd. 3701, 40, Simin-daero 365beon-gil, Dongan-gu, Anyang-si, Gyeonggi-do, 14057, Korea Tel : + 8 2-31-425-6200 / Fax: +82-31 -424-0450 www.kes.co.kr Report No.: KES-RF-20T0111 Page (4 ) of (31) 1. General information Applicant: Ave dro Applicant address: 201 Jones Road 5th floor, Waltham, MA, 02451, United States Test site: KES Co., Ltd. Test site address: 3701, 40, Simin-daero 365beon-gil, Dongan-gu, Anyang-si, Gyeonggi-do, 14057, Korea 473-21, Gayeo-ro, Yeoju-si, Gyeonggi-do, Korea Test Facility FCC Accreditation Designation No.: KR0100, Registration No.: 444148 FCC rule part(s): 15.247 FCC ID: 2 AV G K-KXLRX Test device serial No.: Production Pre-production Engineering 1.1. EUT description Equipment under test Remote Receiver PCBA, ETR Frequency range BLE : 2 402 ㎒ ~ 2 480 ㎒ Model: KXL-1B Receiver PCBA Modulation technique GFSK Number of channels 2 402 ㎒ ~ 2 480 ㎒ : 40 ch Antenna specification Antenna type : Chip antenna, Peak gain : 0.8 ㏈i Power source DC 3.3 V 1.2. Test configuration The Av e d ro KXL-1B Receiver PCBA FCC ID: 2 AV G K-KXLRX was tested per the guidance of KDB 558074 D01 v05r 02. ANSI C63.10-2013 was used to reference the appropriate EUT setup for radiated spurious emissions testing 1.3. Device modifications N/A 1.4. Frequency/channel operations Ch. Frequency (㎒) Rate(Mbps) 00 2 402 1 . . . . . . 20 2 442 1 . . . . . . 39 2 480 1 This report shall not be reproduced except in full, without the written approval of KES Co., Ltd. The results shown in this test report refer only to the sample(s) tested unless otherwise stated. The authenticity of the test report, contact [email protected] KES-QP-7081-06 Rev. 7 KES A4 KES Co., Ltd. 3701, 40, Simin-daero 365beon-gil, Dongan-gu, Anyang-si, Gyeonggi-do, 14057, Korea Tel : + 8 2-31-425-6200 / Fax: +82-31 -424-0450 www.kes.co.kr Report No.: KES-RF-20T0111 Page (5 ) of (31) 1.5. Accessory inf…

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KES Co., Ltd. 3701, 40, Simin-daero 365beon-gil, Dongan-gu, Anyang-si, Gyeonggi-do, 14057, Korea Tel: +82-31-425-6200 / Fax: +82-31-424-0450 www.kes.co.kr Report No.: KES-RF-20T0111 Page (31 ) of (31) This report shall not be reproduced except in full, without the written approval of KES Co., Ltd. The results shown in this test report refer only to the sample(s) tested unless otherwise stated. The authenticity of the test report, contact [email protected] KES-QP-7081-06 Rev. 7 KES A4 Appendix B. Test setup photos Radiated AC conducted Blank The end of test report.