2BBBK-NATURE301wireless earbuds

成品尺寸：435x 92.5mm 材质：128双铜 方式：6折页 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. Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. Note: 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. The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction. FCC warning:

Dongguan Aihu Electronics Technology Co., Ltd U.S. Agent Designation for Service of Process (Applicant and U.S. Agent are Separate Parties) TO: Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046, USA ATTENTION: FCC Certification – Section 2.911(d)(7) Information Designated U.S. Agent Company Name: Baihetian Innovative Solutions FRN: 0033401605 Contact Name: Kenneth Young Street Address: 6837 Chase Rd City/Province/Zip: Dearborn, MI 48126 Telephone No: 313-395-3113 Email: [email protected] This letter is to confirm that we (“the Designated U.S. Agent) have accepted the responsibility to act as the Designated U.S. Agent for Service of Process as required by section 47 CFR 2.911(d)(7) on behalf of the Applicant noted below. U.S. Agent Signature: Date: June 1, 2023 Signed by (Printed Name/Title): Kenneth Young/Manager The Applicant acknowledges that they must maintain an agent for no less than one year after terminating all marketing and importation OR the conclusion of any Commission-related proceeding involving the equipment. The applicant further acknowledges their responsibility to inform the FCC whenever the Designated U.S. Agent information above changes. Applicant Company name: Dongguan Aihu Electronics Technology Co., Ltd Grantee Code: 2BBBK FCC ID: 2BBBK-NATURE301 Contact Name: TIANWEN LI Address: Hongfu dong road2# nongshangyinhang dasha, Dongcheng district, Dongguan, Guangdong, China, 523123 Telephone No: +86 139292482893 Email: [email protected] Applicant Signature: Date: 2023-05-23 Signed by (Printed Name/Title): TIANWEN LI/ Manager

EUT EXTERNAL PHOTOGRAPHS EUT View 1 EUT View 2 EUT View 3 EUT View 4 Right EUT View 5 EUT View 6 EUT View 7 EUT View 8 EUT View 9 Left EUT View 10 EUT View 11 EUT View 12 EUT View 13 EUT View 14 ----------------The end----------------

Dimension：2.55*20mm FCC ID: 2BBBK-NATURE301

EUT INTERNAL PHOTOGRAPHS EUT Housing and Board View 1 Left EUT Housing and Board View 2 EUT Housing and Board View 3 EUT Housing and Board View 4 EUT Housing and Board View 5 EUT Housing and Board View 6 Right EUT Housing and Board View 7 EUT Housing and Board View 8 EUT Housing and Board View 9 EUT Housing and Board View 10 EUT Housing and Board View 11 EUT Housing and Board View 12 ----------------The end---------------- Antenna

FCC ID: 2BBBK-NATURE301 RF exposure evaluation According to§15.247(i), §1.1307 (b) and KDB447498, systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the commission’s guidance. The SAR-based exemption formula of §1.1307(b)(3)(i)(B), repeated here as Formula (B.2), applies for single fixed, mobile, and portable RF sources with available maximum time-averaged power or effective radiated power (ERP), whichever is greater, of less than or equal to the threshold Pth (mW). This method shall only be used at separation distances from 0.5 cm to 40 cm and at frequencies from 0.3 GHz to 6 GHz (inclusive). Pth is given by Formula (B.2). F is in GHz, d is the separation distance (cm), and ERP20cm is per Formula (B.1). When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion.We use 5mm as separation distance to calculate Antenna gain: 2.18dBi Conducted Transmit Power Max: = 1.23dBm = 1.33 mW EIRP=1.23dBm +2.18dBi=3.41dBm ERP= 3.41-2.15dB= 1.26 dBm The maximun ERP power specified is 1.26 dBm = 1.34mW The source- based time-averaging conducted output power =1.34 * Duty factor mW (where Duty Factor≤1) = 1.34mW The SAR Exclusion Threshold Level: 푃 th (mW) = ERP 20cm * (푑/20cm) 푥 (X= ) = 2.72 mW Since the source-based time-averaging conducted output power is well below the SAR low threshold level, so the EUT is considered to comply with SAR requirement without testing.

SMD
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ANTENNA
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Sheet CS -2450-21-B For 2400-2483MH z 2.0x1.2mm [EIA2012] 典型特征 T y p i cal Characterist i cs ■重量轻，结构紧凑 Light weight, compact ■宽带大，低成本 Wide bandwidth, low cost ■高增益内置天线 Built-in antenna with high gain ■工作温度 Operating Temp. : -40°C~+85°C 电气特性 Electrical Characterist ics per line(TA=25°C) 2400~2483 MHz Lin ear dB i 68. 8% % 50 频带 Frequency Band 极 化 P o l a r iz a t i o n * 峰 值 增 益 P e ak Ga i n * 峰 值 效 率 P e a k Effi c i e n c y 阻 抗 Im p e n da n ce 参数Parameter 规格Specification 单位 Units 特征 Feature 应用 Application ■蓝牙,无线局域网,移动电视 Bluetooth, Wireless L AN, Mobile TV ■家用射频系统 Home RF system, etc TECHNOLOGY *测 试 条 件 ： 测 试 板 尺 寸 9 8 × 6 5 mm ； 匹 配 电 路 ： π 型 匹 配 电 路 。 T est co n d i t i o n : T e st boa r d s iz e 9 8 * 6 5 m m ; M a t c h in g c i r c u i t: P i m a t c hi n g c ir c u i t w i l l be re q u i r ed Fi g .1 驻 波 比 V S WR W Chip Antenna CS-2450-21-B 2.18 3D模式 3D Gain Pattern (2400 MHz) 2D模式 2D Gain Pattern (2400 MHz) 增益模式是在 暗 室 进 行 测 试 的 ， 被 测 件 放 在 桌 肩 位 置 ， 用 标 准 的 喇 叭 天 线 和 矢 量 网 络 分 析 仪 来 收 集 数 据 。 Th e Ga i n p a tt e rn i s measu r ed i n FAR - fi e l d c h a m be r . D U T i s p l aced o n e tab l e o f r o t a t o r , a s t a n da r d ho r n a n t e nn a a n d Vec t o r N e t w o rk t o co ll ect da t a . 辐射模式 Radiation Pattern Fig.2 暗室示意图 FAR-field Chamber TECHNOLOGY Chip Antenna t h An a l y z e r i s uesd 3D模式 3D Gain Pattern (2450 MHz) 2D模式 2D Gain Pattern (2450 MHz) 3D模式 3D Gain Pattern (2500 MHz) 2D模式 2D Gain Pattern (2500 MHz) TECHNOLOGY Chip Antenna 1. 30±3 minutes at -40°C±5°C, 2. Convert to +105°C (5 minutes) 3. 30±3 minutes at +105°C±5°C, 4. Convert to -40°C (5 minutes) 5. Total 100 continuous cycles 项目Item 环境Condition 规格Specification 热冲击 Thermal shock No apparent damage Fulfill the electrical spec. after test. 抗湿性 Humidity resistance No apparent damage Fulfill the electrical spec. after test. 1. Humidity: 85% R.H. 2. Temperature: 85±5°C 3. Time: 1000 hours. The dipped surface of the terminal shall be at least 95% covered with solder after dipped in solder bath of 245±5°C for 3±1 seconds. No apparent damage 焊锡性 Solderability 耐焊接热性 Soldering heat resistance No apparent damage 1. Solder bath temperature : 260±5°C 2. Bathing time: 10±1 seconds 低温电阻 Low temperature resistance No apparent damage Fulfill the electrical spec. after test. 1. Temperature: -40°C±5°C 2. Time: 1000 hours. No apparent damage Fulfill the electrical spec. after test. 1. Temperature: 150°C±5°C 2. Time: 1000 hours. 耐高温性 High temperature resistance 推荐回流焊接曲线Recommended Reflow Solder curve (2) 储存环境 Storage Condition (a)仓库：温度应在0～30°C之间，湿度应小于60%湿度，产品应在交货之日起1年内使用。 At warehouse: The temperature should be within 0 ~ 30°C and humidity should be less than 60% RH.The product should be used within 1 year from the time of elivery. (b)在板：温度应在40～85°C之间，湿度应小于85%湿度。On board: The temperature should be within -40~85°C and humidity should be less than 85% RH. (3) 工作环境温度 Operating Temperature Range 工作温度范围：-40°C to +85°C。 Operating temperature range : -40°C to +85°C. TECHNOLOGY Chip Antenna 推荐焊&Evaluation Board (1) 电烙铁的使用 Soldering Gun Procedure 以下注意事项仅针对使用电烙铁进行个别器件更换。 Note the follows, in case of using solder gun for replacement. (a) 使用小于30W的电烙铁，温度不高于350°C，焊接时间小于3秒。 The tip temperature must be less than 350°C for the period within 3 seconds by using soldering gun under 30 W. (b) 烙铁不可直接接触器件本体。 The soldering gun tip shall not touch this product directly. (2) 焊锡量 Soldering Volume 注意焊接过程中过多的焊锡量会损害器件本体。 Note that excess of soldering volume will easily get crack the body of this product. 产品尺寸 Product Dimension TECHNOLOGY Chip Antenna 1 应用环境Application Guide 包装信息Package Information A B C D E F L W 8.00±0.3 3.50± 0.051.75±0.1 2.00±0.054.00±0.1 1.50±0.1 2.30± 0.1 1.55± 0.1 编码规则 Par t Number System CS - 2450 - 21-B External DimensionsL*W(mm)2.0*1.2 Central Frequency2450MHz Product Series: Chip Antenna 丝印 Marking TECHNOLOGY Chip Antenna TECHNOLOGY 订货信息Order Information 设备 Device Package 净重 Net Weight 运送式 Carrier 量 Quantity 认证 HSF Status CS-2450 -21-B 2012 Tape & Reel 5000pcs RoHS compliant 版本信息 Revision history 日期/Date 本/Revision 本描述/Description of changes 0.0014g The contents of this data sheet are subject to change without notice. Please confirm the specifications and delivery conditions when placing your order. © Copyright 2015, Keweixin Electronics All rights reserved Chip Antenna 2021-4-2 2022-1-2 1.0 1.1 First Versio n Second Version

No.：BCTC/RF-EMC-007 Page: 1 of 81 Edition：A.4 TEST REPORT Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2305590059E Applicant: Dongguan Aihu Electronics Technology Co., Ltd Product Name: wireless earbuds Model/Type Reference: Nature 301 Tested Date: 2023-05-19 to 2023-05-23 Issued Date: 2023-06-05 Report No.: BCTC2305590059E No.：BCTC/RF-EMC-007 Page: 2 of 81 Edition：A.4 FCC ID: 2BBBK-NATURE301 The test report is effective only with both signature and specialized stamp. This result(s) shown in this report refer only to the sample(s) tested. Without written approval of Shenzhen BCTC Testing Co., Ltd, this report can’t be reproduced except in full. The tested sample(s) and the sample information are provided by the client. Product Name: wireless earbuds Trademark: Audiovance Model/Type Reference: Nature 301,NT301 Prepared For: Dongguan Aihu Electronics Technology Co., Ltd Address: Hongfu dong road2# nongshangyinhang dasha, Dongcheng district, Dongguan, Guangdong, China, 523123 Manufacturer: Shenzhen Sande Dacom Electronics Co., Ltd Address: Building I, NO.10 East Area of ShangXue Science & Technology Industrial Park,BanTian street, LongGang District, Shenzhen, China Prepared By: Shenzhen BCTC Testing Co., Ltd . Address: 1-2/F., Building B, Pengzhou Industrial Park, No.158, Fuyuan 1st Road, Tangwei, Fuhai Subdistrict, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: 2023-05-19 Sample Tested Date: 2023-05-19 to 2023-05-23 Report No.: BCTC2305590059E Test Standards FCC Part15.247 ANSI C63.10-2013 Test Results PASS Remark: This is Bluetooth Classic radio test report. Tested by: Approved by: Lei Chen/Project Handler Zero Zhou/Reviewer Report No.: BCTC2305590059E No.：BCTC/RF-EMC-007 Page: 3 of 81 Edition：A.4 Table of Content Test Report Declaration Page 1. Version .................................................................................................................. 5 2. Test Summary ....................................................................................................... 6 3. Measurement Uncertainty ..................................................................................... 7 4. Product Information and Test Setup ...................................................................... 8 4.1 Product Information ............................................................................................... 8 4.2 Test Setup Configuration ...................................................................................... 8 4.3 Support Equipment ............................................................................................... 9 4.4 Channel List .......................................................................................................... 9 4.5 Test Mode ........................................................................................................... 10 4.6 Table Of Parameters Of Text Software Setting ................................................... 10 5. Test Facility And Test Instrument Used ............................................................... 11 5.1 Test Facility ......................................................................................................... 11 5.2 Test Instrument Used .......................................................................................... 11 6. Conducted Emissions .......................................................................................... 13 6.1 Block Diagram Of Test Setup .............................................................................. 13 6.2 Limit .................................................................................................................... 13 6.3 Test procedure .................................................................................................... 13 6.4 EUT operating Conditions ................................................................................... 13 6.5 Test Result .......................................................................................................... 14 7. Radiated emissions ............................................................................................. 16 7.1 Block Diagram Of Test Setup .............................................................................. 16 7.2 Limit .................................................................................................................... 17 7.3 Test procedure .................................................................................................... 18 7.4 EUT operating Conditions ................................................................................... 19 7.5 Test Result .......................................................................................................... 20 8. Radiated Band Emission Measurement and Restricted Bands of Operation ...... 24 8.1 Block Diagram Of Test Setup .............................................................................. 24 8.2 Limit .................................................................................................................... 24 8.3 Test procedure .................................................................................................... 25 8.4 EUT operating Conditions ................................................................................... 25 8.5 Test Result .......................................................................................................... 26 9. Spurious RF Conducted Emissions ..................................................................... 28 9.1 Block Diagram Of Test Setup .............................................................................. 28 9.2 Limit .................................................................................................................... 28 9.3 Test procedure .................................................................................................... 28 9.4 Test Result ........................…

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TEST SETUP PHOTOGRAPHS 1.1. Photos of Radiation Emission Measurement Conducted emissions Spurious Emission Test Setup (Below 1GHz) Spurious Emission Test Setup (Above 1GHz) ----------------The end----------------