V5A-NOXS2NOX S2

Nox S2 FCC User Manual Instructions for FCC equipment authorization Item Information Product Nox S2 FCC ID V5A-NOXS2 FCC rule 47 CFR Part 15, Subpart C, § 15.247 Wireless technology Bluetooth Low Energy (BLE), Bluetooth 5.0 Operating frequency 2402 MHz to 2480 MHz Antenna Integral onboard Type-F PCB antenna, non-user-replaceable Power source Internal non-replaceable CR2032 lithium coin cell battery, 3 V Use condition Single-patient use; worn over clothing during sleep study 1. Purpose This draft user manual provides installation and operating instructions for the Nox S2 device for FCC equipment authorization under 47 CFR § 2.1033. 2. Intended Use and Users The Nox S2 System is a portable system intended for the ambulatory recording of physiological signals during sleep using patient-applied sensors. The recorded data is transferred to secure cloud storage and made available for further processing using external sleep study software. The Nox S2 System allows physiological signals to be recorded during sleep tests conducted to aid Healthcare Professionals in diagnosing sleep disorders. The Nox S2 System is intended for patients 18 years of age or older suspected of having sleep-related breathing disorders. It is intended for use in clinical and home settings. Intended users are lay users and Healthcare Professionals. Lay users should know how to use a smartphone or mobile app. 3. System Description The Nox S2 device is a lightweight, battery-powered, single-patient-use device used to measure breathing effort during sleep. The Nox S2 is intended to be worn over clothing. The device is used with Nox RIP belts placed around the chest and abdomen. During use, the Nox S2 device transmits data to the Nox Sleep Study mobile application using Bluetooth Low Energy. The mobile application is used to set up and start the sleep study recording and to receive data from the Nox S2 device. • The Nox S2 device records thorax and abdomen respiratory effort, body position, and activity. • The Nox S2 device has no internal storage and sends data to the mobile application. • The Nox S2 device is single-patient use only and is disposed of after the sleep study is completed. • The battery is internal and non-replaceable. Do not attempt to open the device or replace the battery. 4. Radio Description The Nox S2 contains an intentional Bluetooth Low Energy transmitter operating under 47 CFR Part 15, Subpart C, § 15.247. Parameter Specification Radio chipset Nordic Semiconductor nRF52832 system on chip Wireless technology Bluetooth Low Energy (BLE), Bluetooth 5.0 PHY / data rate LE 1M PHY and LE 2M PHY; up to 2 Mbps Modulation Gaussian Frequency Shift Keying (GFSK), Adaptive Frequency Hopping (AFH) Operating frequency 2.402 GHz to 2.480 GHz Tested channels 2402 MHz, 2442 MHz, and 2480 MHz Rated transmit power +4 dBm conducted setting Measured maximum EIRP Up to approximately 5.916 dBm based on the submitted operational description Antenna Internal onboard Type-F PCB antenna, 1.9 dBi gain, non-user-replaceable User controls The user cannot adjust frequency, modulation, packet format, antenna, or RF output power. 5. Installation and Operating Instructions 5.1 Before Use • Use the Nox S2 only as instructed by a Healthcare Professional. • Use only Nox Medical-approved accessories and compatible devices. • Do not use damaged equipment or sensors. • Do not use the same Nox S2 device on more than one patient. • Do not clean, maintain, service, open, or modify the Nox S2 device. 5.2 Hook-Up • Take the elastic belt and attach one end to the back connector on the Nox S2 chest unit. Make sure it is fully connected. • Put on a T-shirt before placing the chest belt. Wrap the belt around the chest so it sits flat and feels comfortable. Attach the free end of the belt to the second connector to make a loop. • Make sure the cable points downward and that the belt is not twisted. • Attach the abdomen belt in the same way around the abdomen. • When setup is complete, press the button on the chest unit to turn on the Nox S2 device. 5.3 Mobile Application Setup • Open the Nox Sleep Study mobile application on the compatible smartphone or tablet. • Follow the app instructions to scan the QR code or enter the study details manually. • Make sure the required devices are connected before starting the recording. • Keep the smartphone or tablet nearby during the recording so the Bluetooth connection can be maintained. • To avoid interruptions during the recording, keep the smartphone or tablet connected to a power source. 5.4 Recording • Tap Start Recording in the mobile application after the required devices are ready. • The app displays recording time and device connection status during recording. • When the study is complete, follow the app instructions to stop and upload the recording. • Make sure the smartphone or tablet is connected to the internet for upload. 5.5 End of Use and Disposal The Nox S2 device is single-patient use only. After the sleep study is complete, dispose of the Nox S2 device according to local regulations and recycling rules. The device contains electronic parts and an internal non- replaceable lithium coin cell battery and should not be disposed of as unsorted household waste where electronic waste collection is available. 6. Warnings and Cautions • Do not use damaged equipment or sensors. Damaged parts may cause poor performance or injury. • Place cables and connections carefully to reduce the risk of tangling or strangulation. • Do not use the same Nox S2 on more than one patient. This may cause cross-contamination and spread infection. • Do not use any part of the Nox S2 System, including RIP belts, in a Magnetic Resonance (MR) Imaging environment. • Do not use the Nox S2 near flammable anesthetic gases or mixtures with air, oxygen, or nitrous oxide. • Remove the Nox S2 before defibrillation. • Do not use the Nox S2 System or accessories during X-ray or radiography procedures. • Do not use the Nox S2 with high…

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Attestation Statement -FCC Date: 2026-05-12 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, Maryland 21046 Re: Attestation regarding ‘covered’ equipment and the Covered List FCC ID: V5A-NOXS2 To whom it may concern, Per 2.911(d)(5)(i), Gudmundur Hauksson, VP of Engineering of Nox Medical, certifies that the equipment for which authorization is sought is not “covered” equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. Per 2.911(d)(5)(ii), Gudmundur Hauksson, VP of Engineering of Nox Medical, certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List (as a specifically named entity or any of its subsidiaries or affiliates) as an entity producing “covered” equipment. Sincerely, Gudmundur Hauksson VP of Engineering

US Agent Attestation Letter TO: Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, Maryland 21046 Re: section 2.911(d)(7) filing To whom it may concern, This letter is to confirm that Sigurjon Kristjansson has accepted responsibility to act as the agent for service of process as acknowledged by the applicant, Nox Medical. Ehf (Nox Health is a parent group of Nox Medical).. The U.S. Agent further agrees to the obligations defined in the current version of FCC guidance document, KDB 986446. U.S. Agent: Sigurjon Kristjansson Title: CEO Company Name: Nox Health Address: 100 Kimball Place, Suite 100 Alpharetta, GA 30009, USA Telephone No: +1 (855) 617-6691 Email: [email protected] FRN (FCC Registration Number for applicant) 0016743833 FRN (FCC Registration Number for U.S. Agent (if available): The applicant accepts and acknowledges the obligation 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 the equipment. If the U.S. Agent is a test lab or TCB, the entity attests that procedures have been put into place to ensure that the entity remains impartial as defined in ISO 17025 or 17065, as applicable. Signature of Applicant (must be signed by either the contact of record in the FCC database for the applicant grantee code or authorized agent/employee): Signature of U.S. Agent (if different from applicant): Name:Guðmundur Hauksson Name:Sigurjon Kristjansson Date:2026-05-08 Date:2026-05-11

FCC Cover Letter Nox S2 Certification Application Date 2026-05-12 Applicant Nox Medical ehf, Katrinartun 2, 105 Reykjavik, Iceland Product Nox S2 FCC ID V5A-NOXS2 Prepared for Federal Communications Commission / Telecommunication Certification Body To whom it may concern: Nox Medical respectfully submits this cover letter in support of an application for FCC equipment authorization for the Nox S2 product. The Nox S2 device is part of the Nox S2 System, a home sleep testing solution intended for unattended, continuous, ambulatory sleep monitoring in the home environment. The Nox S2 device is a lightweight, single-patient-use, multi-night-capable sensor that records respiratory inductance plethysmography (RIP) signals and activity/body-position information, and streams the collected data to a nearby mobile device using Bluetooth Low Energy. The associated mobile application receives, stores, and supports upload of the encrypted recording data. The radio implementation uses Bluetooth Low Energy 5.0+ functionality implemented in firmware on an nRF52832 microprocessor and is subject to 47 CFR Part 15, Subpart C, § 15.247. The device contains an onboard Type-F PCB Bluetooth antenna and does not use an external antenna connector for end-user operation. The device is powered by a single CR2032 lithium coin cell battery and has no mains connection. Application Summary • Equipment name: Nox S2. • Wireless technology: Bluetooth Low Energy, used for real-time transmission of sensor data to a mobile device. • Antenna: onboard Type-F PCB Bluetooth antenna. • Power source: single 3 V CR2032 lithium coin cell battery. • Intended operating environment: home sleep testing, including unattended overnight operation. • Requested authorization: original certification under 47 CFR Part 15, Subpart C, § 15.247 for the intentional Bluetooth Low Energy transmitter, as supported by the submitted test report and exhibits. Submitted Exhibits The application package includes the supporting exhibits required for review, including the test report, operational description, block diagram, schematics, photographs, labeling information, user documentation, and any confidentiality request letter(s), as applicable. The application relies on a single technical test report for the radio. No multiple-laboratory technical report comparison is applicable. Nox Medical confirms that the device will be marketed and operated in accordance with the applicable FCC rules and the conditions of the grant. The device is not intended to be modified by the end user, and the final product labeling and user documentation will include the applicable FCC compliance statements. Please contact the undersigned if additional information is required during review. Sincerely, Gudmundur Hauksson VP of Engineering Nox Medical [email protected] / +354 570 7170

Request for Confidentiality Letter-FCC 2026-05-08 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, Maryland 21046 Re: Request for confidentiality FCC ID: V5A-NOXS2 To whom it may concern, We hereby respectfully request that under the provision of 47 CFR 0.459 and 0.457(d) the documents listed below and attached with this application for certification be provided with confidential status. • FCC – Nox S2 – Frequency Block Diagram.docx • FCC – Nox S2 – Operational Description.docx • FCC – Nox S2 – Schematics of Radio.docx Any exhibit / information for which we have requested confidentiality, but which may not be accorded such treatment by the FCC, should be returned to us. The documents listed above contain trade secrets that are treated as confidential by us. Substantial competitive harm to us could result should they be made available to the public. Sincerely, Gudmundur Hauksson VP of Engineering Nox Medical ehf

Nox S2 - External Photos - Prepared by: Guðmundur Hauksson Document Number: TF-03641 Revision Number: 01 Issue date: See electronic signature This document is electronically signed and approved by: Guðmundur Hauksson VP of Engineering Karl Andrés Gíslason Technical Lead Medical Equipment Nox S2 Document Number: TF-03641 External Photos Revision Number: 01 TEMP-0140 Controlled Document Template 04 Company Confidential Page 2 of 4 Copyright © 2026 Nox Medical ehf Contents 1 Introduction ........................................................................................................................... 3 1.1 Scope ............................................................................................................................. 3 1.2 Revision History .............................................................................................................. 3 2 External Photos ...................................................................................................................... 4 Nox S2 Document Number: TF-03641 External Photos Revision Number: 01 TEMP-0140 Controlled Document Template 04 Company Confidential Page 3 of 4 Copyright © 2026 Nox Medical ehf 1 Introduction 1.1 Scope This document contains external photos of the Nox S2 product. 1.2 Revision History Table 1 Revision History Revision Description 01 Document created in (2025-009) Verona Nox S2 Document Number: TF-03641 External Photos Revision Number: 01 TEMP-0140 Controlled Document Template 04 Company Confidential Page 4 of 4 Copyright © 2026 Nox Medical ehf 2 External Photos The Nox S2 device is comprised of two plastic enclosures, abdomen and thorax unit. The thorax unit includes an electronic module and a coin cell battery. The units are connected via wire to provide a signal path from the abdomen unit to the electronic module in the thorax unit. Figure 1 Nox S2 device - front Figure 2 Nox S2 device - back

Nox S2 - Label and Location - Prepared by: Guðmundur Hauksson Document Number: TF-03640 Revision Number: 01 Issue date: See electronic signature This document is electronically signed and approved by: Guðmundur Hauksson VP of Engineering Karl Andrés Gíslason Technical Lead Medical Equipment Nox S2 Document Number: TF-03640 Label and Location Revision Number: 01 TEMP-0140 Controlled Document Template 04 Company Confidential Page 2 of 5 Copyright © 2026 Nox Medical ehf Contents 1 Introduction ........................................................................................................................... 3 1.1 Scope ............................................................................................................................. 3 1.2 Revision History .............................................................................................................. 3 2 Label ..................................................................................................................................... 4 3 Location ................................................................................................................................. 5 Nox S2 Document Number: TF-03640 Label and Location Revision Number: 01 TEMP-0140 Controlled Document Template 04 Company Confidential Page 3 of 5 Copyright © 2026 Nox Medical ehf 1 Introduction 1.1 Scope This document contains label and location of the FCC ID for the Nox S2 product. 1.2 Revision History Table 1 Revision History Revision Description 01 Document created in (2025-009) Verona Nox S2 Document Number: TF-03640 Label and Location Revision Number: 01 TEMP-0140 Controlled Document Template 04 Company Confidential Page 4 of 5 Copyright © 2026 Nox Medical ehf 2 Label The label containing the FCC ID is identified by the LBL-S2-A designator. Nox S2 Document Number: TF-03640 Label and Location Revision Number: 01 TEMP-0140 Controlled Document Template 04 Company Confidential Page 5 of 5 Copyright © 2026 Nox Medical ehf 3 Location The lable is placed on the bottom of the Thorax unit of the Nox S2 sensor.

Nox S2 - Internal Photos - Prepared by: Guðmundur Hauksson Document Number: TF-03642 Revision Number: 01 Issue date: See electronic signature This document is electronically signed and approved by: Guðmundur Hauksson VP of Engineering Karl Andrés Gíslason Technical Lead Medical Equipment Nox S2 Document Number: TF-03642 Internal Photos Revision Number: 01 TEMP-0140 Controlled Document Template 04 Company Confidential Page 2 of 6 Copyright © 2026 Nox Medical ehf Contents 1 Introduction ........................................................................................................................... 3 1.1 Scope ............................................................................................................................. 3 1.2 Revision History .............................................................................................................. 3 2 Internal Photos ....................................................................................................................... 4 Nox S2 Document Number: TF-03642 External Photos Revision Number: 01 TEMP-0140 Controlled Document Template 04 Company Confidential Page 3 of 6 Copyright © 2026 Nox Medical ehf 1 Introduction 1.1 Scope This document contains internal photos of the Nox S2 product. 1.2 Revision History Table 1 Revision History Revision Description 01 Document created in (2025-009) Verona Nox S2 Document Number: TF-03642 External Photos Revision Number: 01 TEMP-0140 Controlled Document Template 04 Company Confidential Page 4 of 6 Copyright © 2026 Nox Medical ehf 2 Internal Photos The Nox S2 device is comprised of two plastic enclosures, abdomen and thorax unit. The thorax unit includes an electronic module and a coin cell battery. The units are connected via wire to provide a signal path from the abdomen unit to the electronic module in the thorax unit. Figure 1 shows the enclosures with stamped parts inserted, Figure 2 shows the enclosure with the PCB and coin cell battery installed. Figure 1 Nox S2 device – enclosure with stamped parts Figure 2 Nox S2 device - Internals The wire used to connect the abdomen and thorax units is shown in Figure 3. The resistance of the wire is <=0.5 OHM/m. Nox S2 Document Number: TF-03642 External Photos Revision Number: 01 TEMP-0140 Controlled Document Template 04 Company Confidential Page 5 of 6 Copyright © 2026 Nox Medical ehf Figure 3 Nox S2 device - interface wire The front of the electronic module is shown in Figure 4. The electronic module contains a microprocessor, accelerometer, button, LED and the circuit needed for measurement of respiratory inductance plethysmography (RIP) signals. Figure 4 Nox S2 device - PCBA – front The back of the electronic module is shown in Figure 5, there are several test points used for programming and functional test purposes. Additionally there are bigger test points (TP200, TP202) that provide the RIP interface for the thorax module, interface for the battery terminals (TP106, TP107) and through hole connectors used for soldering the wire from the abdomen unit. Figure 5 Nox S2 device - PCBA - back Nox S2 Document Number: TF-03642 External Photos Revision Number: 01 TEMP-0140 Controlled Document Template 04 Company Confidential Page 6 of 6 Copyright © 2026 Nox Medical ehf Figure 6 shows the stamped parts for the unit. On the left the RIP snap is shown, the positive terminal for the coin cell battery is in the middle and on the right the negative terminal for the battery. Figure 6 Nox S2 device - stamped parts

This report must not be used to claim product certification, approval, or endorsement by A2LA, NIST, or any agency of the U.S. Government. This Report shall not be reproduced, except in full without written approval of the laboratory. Nox Medical Nox S2 FCC 1.1307:2026 FCC 2.1093:2026 Bluetooth Low Energy Report: NOXM0051.9, Issue Date: May 28, 2026 TABLE OF CONTENTS 2023.04.17 Section Page Number Certificate of Evaluation .................................................................................. 3 Revision History .............................................................................................. 4 Facilities .......................................................................................................... 5 Product Description ......................................................................................... 6 Exposure Condition ......................................................................................... 7 Exemption From RF Exposure Evaluation ...................................................... 8 End of Report .................................................................................................. 11 Report No. NOXM0051.92/11 CERTIFICATE OF EVALUATION 2018-09-14 EXRPT.2025.09.03.0 Product compliance is the responsibility of the client; therefore, the tests and equipment modes of operation represented in this report were agreed upon by the client, prior to testing. The results of this test pertain only to the sample(s) tested. The specific description is noted in each of the individual sections of the test report supporting this certificate of test. This report reflects only those tests from the referenced standards shown in the certificate of test. It does not include inspection or verification of labels, identification, marking or user information. As indicated in the Statement of Work sent with the quotation, Element’s standard process is to always use the latest published version of the test methods even when earlier versions are cited in the test specification. Issuance of a purchase order was de facto acceptance of this approach. Otherwise, the client would have advised Element in writing of the specific version of the test methods they wanted applied to the subject testing Last Date of Evaluation: May 15, 2026 Nox Medical EUT: Nox S2 RF Exposure Evaluation Standards Specification Method FCC 1.1307:2026 FCC 2.1093:2026 FCC 1.1307:2026 Results Method Clause Description Applied Results Comments (b)(3)(i)(B) Exemption From RF Exposure Evaluation Yes Compliant None Deviations From Evaluation Standards None Approved By: Donald Facteau, Process Architect Report No. NOXM0051.93/11 REVISION HISTORY 2025.07.22 Revision Number Description Date (yyyy-mm-dd) Page Number 00 None Report No. NOXM0051.94/11 FACILITIES 2025.07.17 Testing was performed at the following location(s) Location Labs (1) Address A2LA (2) ISED (3) BSMI (4) VCCI (5) CAB FDA (6) ☒ California OC01-17 41 Tesla Irvine, CA 92618 (949) 861-8918 3310.04 2834B SL2-IN-E-1154R A-0029 US0158 TL-55 ☐ Minnesota MN01-11 9349 W Broadway Ave. Brooklyn Park, MN 55445 (612) 638-5136 3310.05 2834E SL2-IN-E-1152R A-0109 US0175 TL-57 ☐ Oregon EV01-12 6775 NE Evergreen Pkwy #400 Hillsboro, OR 97124 (503) 844-4066 3310.02 2834D SL2-IN-E-1017 A-0108 US0017 TL-56 ☐ Washington NC01-05 19201 120th Ave NE Bothell, WA 98011 (425) 984-6600 3310.06 2834F SL2-IN-E-1153R A-0110 US0157 TL-67 ☐ Offsite N/A See Product Description N/A N/A N/A N/A N/A N/A See data sheets for specific labs (1) The lab designations denote individual rooms within each location. (OC01, OC02, OC03, etc.) (2) A2LA Certificate No. (3) ISED Company No. (4) BSMI No. (5) VCCI Site Filing No. (6) FDA ASCA No. Report No. NOXM0051.95/11 PRODUCT DESCRIPTION 2018-07-17 Client and Equipment Under Evaluation Information Company Name: Nox Medical Address: Katrinartuni 2 City, State, Zip: IS - 105 Reykjavik, IS - 105 Evaluation Requested By: Gudmundur Hauksson EUT: Nox S2 Date of Evaluation: 5/15/2026 Information Provided by the Party Requesting the Evaluation Functional Description of the Equipment: Sleep sensor Objective: To demonstrate compliance with FCC Requirements for RF exposure for 1.1307 RF exempt devices Report No. NOXM0051.96/11 RF EXPOSURE CONDITION 2018-07-17 The following RF Exposure conditions were used for the assessment documented in this report: Intended Use Portable Location on Body (if applicable) Head/Torso How is the Device Used Device is used at a distance less than 20cm from the user. Radios Contained in the Same Host Device Bluetooth Low Energy Simultaneous Transmitting Radios None Body Worn Accessories Belt accessory is body-worn with a T-shirt in between the device and the skin. Environment General Population/Uncontrolled Exposure Report No. NOXM0051.97/11 EXEMPTION FROM RF EXPOSURE EVALUATION EXRPT.2025.09.03.0 OVERVIEW Section 1.3 of KDB 44798 D04 v01 states that, “Under the new rules, all radio services and operations are subject to Routine Evaluation [§§ 1.1307(b)(1), 2.1033(f), etc.], unless shown to qualify under the exemptions provided in the rules and OET Lab policies for equipment authorization.” The glossary of KDB 447498 D04 v01 specifies that an exempt RF device is defined “solely from the obligation to perform a routine environmental evaluation to demonstrate compliance with the RF exposure limits in § 1.1310; it is not exemption from the equipment authorization procedures described in 47 CFR Part 2, not exemption from general obligations of compliance with the RF exposure limits in § 1.1310 of this chapter, and not exemption from determination of whether there is no significant effect on the quality of the human environment under § 1.1306.” Compliance with the exemption criteria defined in 1.1307(b) confirm compliance with the limits in § 1.1310. COMPLIANCE WITH FCC LIMITS IN 47 CFR §1.1310 Per §1.1307(b)(3), (i) For single RF sources (i.e., any single fixed RF source, mobile device, or portabl…

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Nox S2 Antenna characterization Doc.no: 3-3-TR-880 450-01 Revision History Date Rev. Author Description 2025-10-28 A Pär Berglund Released after internal review Prepared: Pär Berglund Release: 2025-10-28 Page: 2 of 11 Approved: Jonas Strandell Doc.no: 3-3-TR-880 450-01 Rev: A Table of Contents INTRODUCTION .................................................................................................... 3 ANTENNA MEASUREMENTS............................................................................ 4 2.1 VOLTAGE STANDING WAVE RATIO .............................................................................................. 4 2.2 ANTENNA EFFICIENCY .................................................................................................................... 4 2.3 RADIATION PATTERNS ................................................................................................................... 5 2.4 ANTENNA PEAK GAIN ..................................................................................................................... 8 SUMMARY ..............................................................................................................10 A. ANTENNA MEASUREMENT SYSTEM ..........................................................11 Prepared: Pär Berglund Release: 2025-10-28 Page: 3 of 11 Approved: Jonas Strandell Doc.no: 3-3-TR-880 450-01 Rev: A Introduction This paper presents antenna measurements for the Nox S2 BLE antenna. Prepared: Pär Berglund Release: 2025-10-28 Page: 4 of 11 Approved: Jonas Strandell Doc.no: 3-3-TR-880 450-01 Rev: A Antenna measurements The Nox S2 BLE antenna is verified in terms of Voltage Standing Wave Ratio (VSWR), antenna efficiency and radiation patterns. 2.1 Voltage Standing Wave Ratio Voltage Standing Wave Ratio (VSWR) is a measure of how well an antenna is impedance matched to the system impedance. A VSWR of one means a perfect match where all the available power is delivered to the antenna and an infinite VSWR means a short or an open circuit where all the energy is reflected. Figure 2-1 VSWR Nox S2. 2.2 Antenna efficiency The antenna efficiency measurements are carried out in a Satimo SG-23 6 GHz Stargate Antenna Test Chamber. The antenna efficiency, 휀 푇 , is the ratio of the power delivered at the 50Ω antenna interface, 푃 푡 , relative to the power radiated from the antenna, 푃 푟푎푑푖푎푡푒푑 . 휀 푇 = 푃 푟푎푑푖푎푡푒푑 푃 푡 The antenna system efficiency can be expressed in dB or %, where 100% corresponds to 0dB. Prepared: Pär Berglund Release: 2025-10-28 Page: 5 of 11 Approved: Jonas Strandell Doc.no: 3-3-TR-880 450-01 Rev: A Table 1 Antenna efficiency for the Nox S2 BLE antenna. Frequency Efficiency [MHz] [%] [dB] 2402 26 -5.81 2407 26 -5.82 2412 26 -5.92 2417 26 -5.79 2422 28 -5.58 2427 28 -5.51 2432 27 -5.66 2437 26 -5.77 2442 26 -5.78 2447 27 -5.68 2452 26 -5.78 2457 26 -5.88 2462 26 -5.86 2467 27 -5.74 2472 26 -5.86 2477 24 -6.14 2480 23 -6.29 2.3 Radiation patterns The antenna radiation pattern measurements are carried out in a Satimo SG-23 6 GHz Stargate Antenna Test Chamber. Radiation patterns are presented for three measurement planes: XY-, XZ- and YZ-planes as well as a 3D pattern visualising the radiation pattern around the DUT. -7 -6 -5 -4 -3 -2 -1 0 dB Antenna efficiency Prepared: Pär Berglund Release: 2025-10-28 Page: 6 of 11 Approved: Jonas Strandell Doc.no: 3-3-TR-880 450-01 Rev: A Figure 2-2 Measurement plane definitions. Figure 2-3 Satimo SG-23 6 GHz Stargate Antenna Test Chamber. Prepared: Pär Berglund Release: 2025-10-28 Page: 7 of 11 Approved: Jonas Strandell Doc.no: 3-3-TR-880 450-01 Rev: A Figure 2-4 2D radiation patterns for the Nox S2. Prepared: Pär Berglund Release: 2025-10-28 Page: 8 of 11 Approved: Jonas Strandell Doc.no: 3-3-TR-880 450-01 Rev: A Figure 2-5 3D radiation pattern @2442MHz for the Nox S2. Maximum antenna peak gain is found to be in a cut that is not covered by the three planes XY, XZ and YZ. 2.4 Antenna peak gain The antenna peak gain is summarized in Table 2. Table 2 Antenna peak gain for the Nox S2 BLE antenna. Frequency Antenna Peak Gain [MHz] [dBi] 2402 1.8 2407 1.9…

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