RVBXST400-BTElectronic Thermometer

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Applicant Declaration Applicant Declaration Rev:0. 0 SGS North America Inc. 620 Old Peachtree Road SUITE 100 Suwanee, Georgia 30024 United States Applicant Legal Business Name Chois Technology Co., Ltd. Address S-1404, 32, Songdogwahak-ro, Yeonsu-gu, Incheon, South Korea Grantee Code RVB FCC ID RVBXST400-BT Authorized Contact Name Sanghwan Nam Contact Email [email protected] Contact Phone 82-70-8797-8922 I, the undersigned, certify that I am an authorized signatory for the Applicant and therefore declare; a) in accordance with 47CFR2.911(d), all of the statements herein and the exhibits attached hereto are true and correct to the best of my knowledge and belief. b) in accepting a Grant of Equipment Authorization issued by a TCB, under the authority of the FCC, as a result of the representations made in this application, the Applicant is responsible for: (1) labeling the equipment with the exact FCC ID as specified in this application, (2) compliance statement labeling pursuant to the applicable rules, (3) compliance of the equipment with the applicable technical rules, c) if the Applicant is not the actual manufacturer of the equipment, appropriate arrangements have been made with the manufacturer to ensure that production units of this equipment will continue to comply with the FCC’s technical requirements. d) in accordance with 47 CFR 2.909 and KDB394321, the Applicant has read, understood and agrees to accept that they are the responsible party and agree to abide by their responsibilities as specified under 47 CFR 2.909 and KDB394321. e) in accordance with ISO17065, FCC KDB641163, FCC KDB610077, KDB394321 and RSP-100, the Applicant has read, understood, accepts and agrees to abide by the post market surveillance requirements. (1) the Applicant understands, accepts and agrees that a sample may be requested for surveillance testing. (2) the Applicant shall make provisions to always have a production sample available upon request by SGS, FCC and/or ISED. (3) the Applicant shall, upon request by SGS, at the Applicant’s expense, provide a production sample of the requested product to SGS, FCC and/or ISED as instructed. The sample shall include all support devices, cables, software, accessories or other hardware or software required for evaluation, review, certification and audit surveillance of products certified by SGS. f) neither the Applicant nor any party to the application is 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. §862 because of a conviction for possession or distribution of a controlled substance. See 47CFR 1.2002(b) for the definition of a “party” for these purposes. g) the Applicant has read, understood, accepts and agrees to abide by the SGS North America, Inc.(TCB) terms and conditions. Link to CFRs: https://www.fcc.gov/wireless/bureau-divisions/technologies-systems-and-innovation-division/rules-regulations-title-47 Link to KDBs: https://apps.fcc.gov/oetcf/kdb/index.cfm Link to RSP-100: https://www.ic.gc.ca/eic/site/smt-gst.nsf/eng/sf01130.html Applicant Signature: Date: March 15, 2021 Print Name: Sanghwan Nam Title: Manager *NOTE: This declaration cannot be signed by an Agent, it shall be signed by an authorized person listed in the FCC database

S-1404, 32, Songdogwahak-ro, Yeonsu-gu, Incheon, South Korea, 21984 March 15, 2021 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road, Columbia, MD 21046 To Whom It May Concern: I, the undersigned, hereby authorize Lab Manager Hyunchae, You (or Jungmin, Yang) of SGS Korea Co., Ltd. and hereafter referred to as SGS Korea, 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 Lab Manager Hyunchae, Yo u (or Jungmin, Yang) of SGS Korea 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 SGS Korea 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; S-1404, 32, Songdogwahak-ro, Yeonsu-gu, Incheon, South Korea, 21984 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; 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, Name/Title : Sanghwan Nam / Deputy General Manager Company Name : Chois Technology Co., Ltd.

S-1404, 32, Songdogwahak-ro, Yeonsu-gu, Incheon, South Korea, 21984 March 15, 2021 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road, Columbia, MD 21046 Request of Confidentiality for FCC ID : RVBXST400-BT To Whom It May Concern: Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules (CFR 47), and Section 552 (b) (4) of the Freedom of Information Act, Chois Technology Co., Ltd. hereby requests confidentiality and treatment of certain information accompanying this application. The materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these matters might be harmful to the Applicant and provide unjustified benefits to its competitors. We are also hereby request Short-Term Confidentiality for 180 days after the grant as outlined in Public Notice DA 04-1705. This provision will give Chois Technology Co., Ltd. temporary confidentiality of commercially sensitive information prior to product release. The requested Permanent and Temporary Confidential exhibits are listed as follows: CONFIDENTIAL LIST Permanent 1 Block Diagram 2 Operational Descriptions 3 Schematics 4 - Short-Te r m 5 External Photos 6 Internal Photos 7 Te s t-Setup Photos 8 User’s Manual S-1404, 32, Songdogwahak-ro, Yeonsu-gu, Incheon, South Korea, 21984 The Applicant understands that pursuant to Rule 0.457, disclosure of this application and all accompanying documentations, where applicable, will not be made public before the date of the Grant for this application. Sincerely yours, Name/Title : Sanghwan Nam / Deputy General Manager Company Name : Chois Technology Co., Ltd.

External photos of EUT Top view of EUT Bottom view of EUT Side view of EUT

Electronic Thermometer XST400 MEASUREMENT SITE : ARMPIT Rating : CR2016(DC3V, 90mAh) OBELIS S.A Bd.Général Wahis 53 1030 Brussels, BELGIUM ChoisTechnology Co., Ltd. KM HEALTHCARE 7811 N. Shepherd Dr. Ste# 215-A, Houston, TX 77088, USA ECREP XST400 Label Information Regulatory information for other regions

Internal photos of EUT Internal view of EUT Top view of Main PCB Bottom view of Main PCB View of Antenna & Module Antenna Module

FCC ID: RVBXST400-BT According to KDB 447498 D01 General RF Exposure Guidance. At 100 ㎒ to 6 ㎓ and for test separation distances ≤ 50 ㎜, the SAR test exclusion threshold is determined according to the following [(max. power of channel, including tune-up tolerance, ㎽) / (min. test separation distance, ㎜)] x [√f(㎓)] ≤ 3.0 1. SAR test exclusion threshold Frequency: 2 480 ㎒ (min. separation distances = 0 ㎜) SAR test exclusion thresholds(5 ㎜) = 3 x 5 / (√ 2.480 ) = 9.525 ㎽ Max. tune-up tolerance (㎽) SAR Test Exclusion Thresholds (5 ㎜) (㎽) 2 9.525 Calculation value: 2 (㎽) / 5 (㎜) x √ 2.480 = 0.630 So, Calculation value ≤ 3.0 Remark; - Max. conducted power (㎽): maximum tolerance power of EUT (2 ㏈m) - Max. conducted power 1.585 (㎽), so 2 (㎽) was calculated. - When the minimum test separation distance is < 5 ㎜, a distance of 5 ㎜ is applied to determine SAR test exclusion. 2. Conclusion: No SAR is required.

SGS Korea Co., Ltd. 4, LS-ro 182beon-gil, Gunpo-si, Gyeonggi-do, Korea, 15807 Tel. +82 31 428 5700 / Fax. +82 31 427 2370 http://www.sgsgroup.kr Report Number: F690501-RF-RTL001796 Page: 2 of 30 RTT7081-02(2020.10.05)(0) A4(210 mm * 297 mm) INDEX Table of contents 1. General Information -------------------------------------------------------------------------------------- 3 2. Transmitter Radiated Spurious Emissions and Conducted Spurious Emission ----------- 8 3. 6 ㏈ Bandwidth ------------------------------------------------------------------------------------------- 21 4. Maximum Peak Conducted Output Power --------------------------------------------------------- 24 5. Power Spectral Density --------------------------------------------------------------------------------- 27 6. Antenna Requirement ----------------------------------------------------------------------------------- 30 SGS Korea Co., Ltd. 4, LS-ro 182beon-gil, Gunpo-si, Gyeonggi-do, Korea, 15807 Tel. +82 31 428 5700 / Fax. +82 31 427 2370 http://www.sgsgroup.kr Report Number: F690501-RF-RTL001796 Page: 3 of 30 RTT7081-02(2020.10.05)(0) A4(210 mm * 297 mm) 1. General Information 1.1. Testing Laboratory SGS Korea Co., Ltd. (Gunpo Laboratory) - 10-2, LS-ro 182beon-gil, Gunpo-si, Gyeonggi-do, Korea, 15807 - 4, LS-ro 182beon-gil , Gunpo-si, Gyeonggi-do, Korea, 15807 - Designation number: KR0150 All SGS services are rendered in accordance with the applicable SGS conditions of service available on request and accessible at http://www.sgs.com/en/Terms-and-Conditions.aspx. Phone No. : +82 31 688 0901 Fax No. : +82 31 688 0921 1.2. Details of Applicant Applicant : Chois Technology Co., Ltd. Address : S-1404, 32, Songdogwahak-ro, Yeonsu-gu, Incheon, South Korea, 21984 Contact Person : Nam, Sang-Hwan Phone No. : +82 32 246 3404 1.3. Details of Manufacturer Company : Same as applicant Address : Same as applicant 1.4. Description of EUT Kind of Product Electronic Thermometer Model Name XST400 Power Supply DC 3 V Frequency Range 2 402 ㎒ ~ 2 480 ㎒ (Bluetooth Low Energy) Modulation Technique GFSK Number of Channels 40 channels Antenna Type PCB Pattern Antenna Antenna Gain -5.35 ㏈i H/W Version REV1.00 S/W Version REV1.00 SGS Korea Co., Ltd. 4, LS-ro 182beon-gil, Gunpo-si, Gyeonggi-do, Korea, 15807 Tel. +82 31 428 5700 / Fax. +82 31 427 2370 http://www.sgsgroup.kr Report Number: F690501-RF-RTL001796 Page: 4 of 30 RTT7081-02(2020.10.05)(0) A4(210 mm * 297 mm) 1.5. Test Equipment List Equipment Manufacturer Model S/N Cal. Date Cal. Interval Cal. Due Signal Generator R&S SMR40 100272 Jun. 18, 2020 Annual Jun. 18, 2021 Signal Generator R&S SMBV100A 255834 Jun. 03, 2020 Annual Jun. 03, 2021 Spectrum Analyzer R&S FSV30 103101 Jun. 01, 2020 Annual Jun. 01, 2021 Spectrum Analyzer Agilent N9020A MY53421758 Sep. 04, 2020 Annual Sep. 04, 2021 Attenuator 40AH2W-10 40G-3 AEROFLEX / INMET Jun. 16, 2020 Annual Jun. 16, 2021 High Pass Filter Wainwright Instrument GmbH WHK3.0/18G-10SS 344 May 18, 2020 Annual May 18, 2021 High Pass Filter Wainwright Instrument GmbH WHNX7.5/26.5G-6SS 15 Jun. 05, 2020 Annual Jun. 05, 2021 Low Pass Filter Mini-Circuits NLP-1200+ V9500401023-2 Jun. 01, 2020 Annual Jun. 01, 2021 Power Sensor R&S NRP-Z81 101421 Dec. 23, 2020 Annual Dec. 23, 2021 DC Power Supply R&S HMP2020 020089489 May 20, 2020 Annual May 20, 2021 Preamplifier H . P. 8447F 2944A03909 Aug. 06, 2020 Annual Aug. 06, 2021 Signal Conditioning Unit R&S SCU-18 10117 Jun. 10, 2020 Annual Jun. 10, 2021 Preamplifier MITEQ Inc. JS44-18004000-35-8P 1546891 May 08, 2020 Annual May 08, 2021 Loop Antenna Schwarzbeck Mess-Elektronik FMZB 1519 1519-039 Aug. 22, 2019 Biennial Aug. 22, 2021 Bilog Antenna Schwarzbeck Mess-Elektronik VULB 9163 396 Mar. 21, 2019 Biennial Mar. 21, 2021 Bilog Antenna Schwarzbeck Mess-Elektronik VULB 9163 01126 Dec. 22, 2020 Annual Dec. 22, 2021 Horn Antenna R&S HF906 100326 Feb. 04, 2021 Annual Feb. 04, 2022 Horn Antenna Schwarzbeck Mess-Elektronik BBHA 9170 9170-540 Nov. 26, 2020 Annual Nov. 26, 2021 Test Receiver R&S ESU26 100368 Nov. 05, 2020 Annual Nov. 05, 2021 Turn Table Innco systems GmbH DS 1200 S N/A N.C.R. N/A N.C.R. Controller Innco systems GmbH CONTROLLER CO3000-4P CO3000/963/38 330516/L N.C.R. N/A N.C.R. Antenna Mast Innco systems GmbH MA4640-XP-ET MA4640/536/38 330516/L N.C.R. N/A N.C.R. Anechoic Chamber SY Corporation L × W × H (9.6 m × 6.4 m × 6.6 m) N/A N.C.R. N/A N.C.R. Coaxial Cable RFONE MW X221-NMSNMS (4 m) J1023142 Dec. 01, 2020 Semi- annual Jun. 01, 2021 Coaxial Cable RFONE PL520-NMNM-10M (10 m) 20200324001 Dec. 01, 2020 Semi- annual Jun. 01, 2021 Coaxial Cable Rosenberger LA1-C006-1500 131014 01/20 Feb. 19, 2021 Semi- annual Aug. 19, 2021 SGS Korea Co., Ltd. 4, LS-ro 182beon-gil, Gunpo-si, Gyeonggi-do, Korea, 15807 Tel. +82 31 428 5700 / Fax. +82 31 427 2370 http://www.sgsgroup.kr Report Number: F690501-RF-RTL001796 Page: 5 of 30 RTT7081-02(2020.10.05)(0) A4(210 mm * 297 mm) 1.6. Summary of Test Results The EUT has been tested according to the following specifications: APPLIED STANDARD: FCC Part15 Subpart C Section Test Item(s) Result 15.205(a) 15.209 15.247(d) Transmitter Radiated Spurious Emissions and Conducted Spurious Emission Complied 15.247(a)(2) 6 ㏈ Bandwidth Complied 15.247(b)(3) Maximum Peak Conducted Output Power Complied 15.247(e) Power Spectral Density Complied 15.207 AC Power Line Conducted Emission N/A 1) Note; 1) The AC power line test was not performed because the EUT use battery power for operation and which do not operate from the AC power lines. 1.7. Test Procedure(s) The measurement procedures described in the American National Standard of Procedure for Compliance Testing of unlicensed Wireless Devices (ANSI C63.10-2013) and the guidance provided in KDB 558074 D01 15.247 Meas Guidance v05r02 were used in the measurement of the DUT. 1.8. Sample Calculation Where relevant, the following sample calculation is provided: 1.8.1. Conducted Test Offset value (㏈) = Attenuator (㏈) + Cable loss (㏈) 1.8.2. Radiation Tes…

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Test setup photos of EUT 1. Orthogonal plane of EUT - The testing was set in the three orthogonal planes and measured for each position (X, Y, Z). X-axis Y-axis Z-axis 2. Photo of Radiated Spurious Emission Test (Below 1㎓) 3. Photo of Radiated Spurious Emission Test (Above 1㎓) 4. Photos of Conducted test