TJ7-H21BTRUE WIRELESS EARBUDS

产品结构说明 包 装清单 以上图片仅供参考，请以实物为准！ 充电座耳机 x 1耳机 x 2 耳机1对，充电盒1个，大中小耳帽各一对（中号佩戴在耳机上），数据线1根，说明书1本 说明书 x 1 耳 帽 x 3数据线 x 1 LED指 示灯 充电Type-C端口 左/L 多功能按键（MFB） LED指示灯 开 机 方法1：耳机放在充电盒， 打开盖子，取出双耳机，橙白灯亮 1 秒， 即开机； 方法2：关机状态下，耳机在充电盒外，触摸 1下，橙白灯亮1秒， 即开机。 方法 1 从充电盒中取出双耳机 , 耳机自动开机并进入配对模式，LED 橙白灯交替快闪，即进入手机配 对模式； 打开蓝牙设备，并 在设备列表中选择“ H21B”并连接，即配对成功 ; 方法 2 在开机未连接状态下，双击左耳右耳多功能键 进入手机配对模式；LED 橙白灯交替快闪； 打开蓝牙设备，并在设备列表中选择“H21B”，并连接，即配对成功。 （注意: 如果耳机已连接设备1，则设备1 的蓝牙请关闭蓝牙功能，然后尝试与设备 2 配对。） 重置和 清除配 对 耳机在充电盒外，长按多功能键约8秒释放并在10秒内双击多功能键，白灯快闪 , 进入自动 配对模式，即重置完成。 关 机 方法1：开机状态，将耳机放入充电盒内，橙灯常亮，即关机； 方法2：开机状态下，耳机在充电盒外，长按左右耳多功能键3s后释放橙灯亮1s，即关机。 多功能键 使用 长按1 秒 长按2秒 左 耳 长按2秒 快速按2次 快速按2次 长按2秒 右 耳 + 通透模式 / 通透模式关 快速按3次 启动SIRI 快速按3次 - 产品使用 说明 蓝牙配 对 通透模式 常见问题 在待机状态/音乐状态下： 您可以通过打开通透模式来捕获周围的声音。当您要 关注环境情况或进行对话时，此功能 非常方便。 操作方法：长按右耳多功能键2秒钟释放，进入通透模式;以通透模式→通透模式关闭的 顺序切换。 Q: 无法连接到手机： 1. 确保本产品电量充足，已开机，并与手机配对建立连接完成。 2. 手机的蓝牙功能启动。 3. 本产品与手机之间的距离是否超过 10 米（约30 英尺，以及二者之间是否存在着墙壁等 障碍物或其他电子设备。 4. 请恢复至出厂设置后重新配对。 Q: 听不到任何声音 请尝试调高手机音量。 Q: 听到杂音 蓝牙为一种无线技术，这意味着它对本产品与配对设备之间的物体非常敏感。其设计使用 条件为：本产品与配对装置间相距不超过 10 米，两者之间不存在大的障碍物（如墙面等）。 备注：若于户外吵杂的环境下，可能会影响声音效果。 ● 本产品由充电电池供电。新电池只有在经过两、三次完全充电和放电的周期后才能达到较 佳性能。电池可以重复充电、放电，但最终会失效。 ● 如果把本产品放在过热或过冷的地方，如在夏天或冬天将其放在封闭汽车里，会减少电池 的容量和寿命。应尽量将电池温度保持在 15°C和25°C之间。本产品电池过冷或过热可能会使 其暂时无法工作，即使电池电量充足。当温度远低于冰点时，电池的性能尤其受到限制。 ● 请勿将电池掷入火中，以免电池爆炸。受损电池也可能会爆炸。请按当地规定处理电池。 请在可能的情况下回收电池。不可将电池作为生活垃圾处理。 温馨提醒：本产 品若不常使用，请 每三个月充放电一次，避免电池过久没使用，而造成 电池损坏。 电池信息 右/Ｒ H21B 真无线蓝牙耳机使用说明书 使用前请阅读使用说明 1 pair of ear buds, 1 charging case, 3 pairs of tips (size: S, L; M tips already on the earbuds), 1 USB cable, 1 User Manual. HearT hrough Mode C ommon questions Q: Unable to connect to phone: 1. Ensure that the product has sufficient battery, has been turned on, and has been paired with the phone to establish connection. 2. The phone’ s Bluetooth activates. 3. Whether the distance between the product and the phone is more than 10 meters (about 30 feet), and whether there are walls, other obstacles or other electronic devices between them. 4. Please reset to factory settings and then re-pair. Q: No voice heard Please try to turn up the phone's volume. Q: Have noise Bluetooth is a wireless technology, which means it is very sensitive to objects between the product and the device it is paired with. The design conditions for use are: the distance between the product and the matching device is no more than 10m, and there is no big obstacle (such as wall) between the two. Note: The sound effect may be affected in noisy outdoor environment. ● This product is powered by rechargeable battery. New battery performs better after two or This product is powered by rechargeable battery. A new battery will performance better after two or three complete charge and discharge cycles. The battery can be charged and discharged repeatedly, but it will eventually fail. If this product is placed in a over hot or over cold place, such as in a closed car in summer or winter, the capacity and life of the battery will be reduced. It is recommended to store in 15 to 20 environments. It may not work in extreme cold or hot environment even if it is fully charged. The battery’ s performance will be restricted when the temperature is far below freezing. Do not throw the battery into fire to prevent it from exploding. Damaged battery may also explode. Please follow the local regulations to deal with the battery. Please recycle the battery when possible, and do not dispose of it as household garbage. Warm Tips: If this product is not used frequently, please regularly recharge and discharge it every three months, to avoid battery damage caused by unused for too long time. Ba ttery information In standby state/music state: You can capture surrounding sounds by turning on the HearThrough mode . When you want to pay attention to the environment or have a conversation, this function is very convenient. Operation method: long press the right MFB for 2s to enter the HearThrough mode; switch in the order : HearThrough mode HearThrough mode Off. H21B TR UE WIRELESS EARBUDS USER MANUA L P lease read the Manual before use. Pr oduct Structure Description P acking List P icture only for reference! Charging Case × 1 Earbud x 2User Manual x 1Eartips x 3USB cable x 1 LED light TYPE-C Charging Port RightLeft Multi-Function Button（MFB） LED light P ower O P ower On T he earbuds will turn on automatically when taken out from the charging case, with orange and white light is on for 1s; When the earbuds shut down, touch the MFB oncethen the orange and white light is on for 1s to boot up. Method 1 Take out two earbuds, they will turn on and enter pairing mode automatically with orange and white indicator lights twinkling alternately; which enable the bluetooth of your phone to search "H21B" and then click it for pairing, it will be connected. Method 2 When the earbuds are turned on and not connected, press twice the left and right MFB to enter pairing mode with orange and white indicator lights twinkling alternately. Which enable the bluetooth of your phone to search "H21B" and then click it for pairing, it will be connected. (Note: If the earbuds have been connected to device 1, please turn off the bluetooth function of device 1 and then try to pair with device 2.) R eset When the earbuds are out of the charging case , long press the left and right MFB for 8s, and then double-tap the left and right MFB within 10s; the white light will flash quickly, a few seconds later the earbuds will re-enter the pairing mode The earbuds will turn off automatically when put back into the charging case, with the orange light always on When the earbuds is on and out of the charging case, long press the left or right MFB for 3s, then the orange light is on for 1s, that means the earbuds shut down. Use of MFB Use Ins tructions Bluetooth pairing P ress for 2s Press for 2s Press for 2s Press for 1s Le ft Right Start SIRI P ress twice Press twice Triple Press Triple Press + Ambient ON / Ambient OF - Changes or modifications not expressly approved by the party …

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Shenzhen SHI KISB Electronic Co., Ltd. Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 2021-07-28 Subject; Request for Long Term Confidentiality FCC ID: TJ7-H21B To Whom It May Concern, Pursuant to the provisions of the Commission’s rules Title 47 Sections §0.457 and §0.459, we are requesting the Commission to withhold the following attachment(s) as confidential documents from public disclosure indefinitely. These documents contain detailed system and equipment descriptions and are considered as proprietary information in operation of the equipment. The public disclosure of these documents might be harmful to our company and would give competitors an unfair advantage in the market. Schematic Diagram Block Diagram Parts List Operational Description Tune-up Procedure It is our understanding that all measurement test reports, FCC ID label format and correspondence during the certification review process cannot be granted as confidential documents and this information will be available for public review once the grant of equipment authorization is issued. Sincerely, Signature: Name: KK Lee Title: General Manager

Shenzhen SHI KISB Electronic Co., Ltd. Agent Authorization Company: Shenzhen SHI KISB Electronic Co., Ltd. Address: 3-5F, A Building, Shanghe Industrial Zone, Nanchang Road, Bao'an District, Shenzhen, 518126 China Product Name: TRUE WIRELESS EARBUDS Model Number(s): H21B Product Description: TRUE WIRELESS EARBUDS We authorize MiCOM Labs Inc., 575 Boulder Court, Pleasanton, California 94566, USA, to act on our behalf on all matters concerning the certification of above named equipment. We declare that MiCOM Labs Inc. is allowed to forward all information related to the approval and certification of equipment to the regulatory agencies as required and to discuss any issues concerning the approval application. Any and all acts carried out by MiCOM Labs on our behalf shall have the same effect as acts of our own. Signature: Date: 2021-07-28 Name: KK Lee Title: General Manager Company: Shenzhen SHI KISB Electronic Co., Ltd.

Page 1 of 4 Appendix C: Photographs of EUT Product: TRUE WIRELESS EARBUDS Model: H21B External Photos Page 2 of 4 Page 3 of 4 Page 4 of 4

Label Artwork and Location Model: H21B Label: Size: L*W=12*3.5mm FCC ID: TJ7-H21B Location

RF exposure evaluation §2.1093 Radiofrequency radiation exposure evaluation: Portable Devices. According to§15.247(i) and§1.1307b(1), 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 1-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances ≤ 50 mm are determined by: [(max. power of channel, including tune-up tolerance, mW) / (min. test separation distance, mm)] · [√f(GHz)] ≤ 3.0 for 1-g SAR, where  f(GHz) is the RF channel transmit frequency in GHz  Power and distance are rounded to the nearest mW and mm before calculation  When the minimum test separation distance is < 5 mm, a distance of 5 mm according is applied to determine SAR test exclusion.  The result is rounded to one decimal place for comparison  For BDR + EDR: Channel Frequency (GHz) Max. Power (dBm) Tune up Power (dBm) Max. Tune up Power (dBm) Max. Tune up Power (mW) Test distance (mm) Result exclusion thresholds for 1-g SAR CH 0 2.402 -2.281 -2±1 -1 0.79 5 0.25 3.0 Result: Base on the calculation value, No SAR measurement is required.

Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com TEST REPORT FCC ID. ............................ : TJ7-H21B Test Report No. ............... : TCT210709E014 Date of issue ................... : Jul. 26, 2021 Testing laboratory .......... : SHENZHEN TONGCE TESTING LAB Testing location/ address: TCT Testing Industrial Park Fuqiao 5th Industrial Zone, Fuhai Street, Bao'an District Shenzhen, Guangdong, 518103, People's Republic of China Applicant's name ............ : Shenzhen SHI KISB Electronic Co., Ltd. Address ........................... : 3-5F, A Building, Shanghe Industrial Zone, Nanchang Road, Bao'an District, Shenzhen, 518126 China Manufacturer's name ... : SHENZHEN SHI KISB ELECTRONIC CO., LTD. Address ........................... : 3-5/F, A Building Shanghe Industrial Park Nanchang Road, Xixiang Town Bao’an District Shenzhen, Guangdong,518103 P.R. China Standard(s) ..................... : FCC CFR Title 47 Part 15 Subpart C Section 15.247 FCC KDB 558074 D01 15.247 Meas Guidance v05r02 ANSI C63.10:2013 Test item description ..... : TRUE WIRELESS EARBUDS Trade Mark ...................... : Lindero, SounSparking, Sounkindy, SounSwet, Eryin, SounMelow Model/Type reference ..... : H21B Rating(s) ......................... : Rechargeable Li-ion Battery DC 3.7V Date of receipt of test item ......................................... : Jul. 09, 2021 Date (s) of performance of test ................................... : See dates for each test case Tested by (+signature) ... : Rleo Check by (+signature) .... : Beryl Zhao Approved by (+signature): Tomsin General disclaimer: This report shall not be reproduced except in full, without the written approval of SHENZHEN TONGCE TESTING LAB. This document may be altered or revised by SHENZHEN TONGCE TESTING LAB personnel only, and shall be noted in the revision section of the document. The test results in the report only apply to the tested sample. Report No.: TCT210709E014 Page 2 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Table of Contents 1. General Product Information ................................................................... 3 1.1. EUT description ..................................................................................................... 3 1.2. Model(s) list............................................................................................................ 3 1.3. Operation Frequency ............................................................................................ 4 2. Test Result Summary ............................................................................... 5 3. General Information .................................................................................. 6 3.1. Test environment and mode ................................................................................. 6 3.2. Description of Support Units ................................................................................ 6 4. Facilities and Accreditations ................................................................... 7 4.1. Facilities ................................................................................................................. 7 4.2. Location ................................................................................................................. 7 4.3. Measurement Uncertainty ..................................................................................... 7 5. Test Results and Measurement Data ...................................................... 8 5.1. Antenna requirement ............................................................................................ 8 5.2. Conducted Emission ............................................................................................. 9 5.3. Conducted Output Power ................................................................................... 13 5.4. 20dB Occupy Bandwidth .................................................................................... 14 5.5. Carrier Frequencies Separation ......................................................................... 15 5.6. Hopping Channel Number .................................................................................. 16 5.7. Dwell Time ............................................................................................................ 17 5.8. Pseudorandom Frequency Hopping Sequence ................................................ 18 5.9. Conducted Band Edge Measurement ................................................................ 19 5.10.Conducted Spurious Emission Measurement .................................................. 20 5.11.Radiated Spurious Emission Measurement ..................................................... 21 Appendix A: Test Result of Conducted Test Appendix B: Photographs of Test Setup Appendix C: Photographs of EUT Report No.: TCT210709E014 Page 3 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 1. General Product Information 1.1. EUT description Test item description ........... : TRUE WIRELESS EARBUDS Model/Type reference ........... : H21B Sample Number....................: TCT210709E014-0101 Bluetooth Version ................ : V5.2 Operation Frequency ........... : 2402MHz~2480MHz Transfer Rate ........................ : 1/2/3 Mbits/s Number of Channel .............. : 79 Modulation Type ................... : GFSK, π/4-DQPSK, 8DPSK Modulation Technology ....... : FHSS Antenna Type ........................ : Ceramic Antenna Antenna Gain ........................ : -1.19dBi Rating(s) ............................... : Rechargeable Li-ion Battery DC 3.7V Remark .................................. : / Note: The antenna gain listed in this report is provided by applicant, and the test laboratory is not responsible for this parameter. 1.2. Model(s) list None. Report No.: TCT210709E014 Page 4 of 87 Hotline: 400-6611-140 Tel: 8…

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Report No.: TCT210709E014 Page 61 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Band Edge(Hopping) Condition Mode Frequency (MHz) Antenna Hopping Mode Max Value (dBc) Limit (dBc) Verdict NVNT 1-DH1 2402 Ant1 Hopping -48.41 -20 Pass NVNT 1-DH1 2480 Ant1 Hopping -46.6 -20 Pass NVNT 2-DH1 2402 Ant1 Hopping -49 -20 Pass NVNT 2-DH1 2480 Ant1 Hopping -46.89 -20 Pass NVNT 3-DH1 2402 Ant1 Hopping -48.73 -20 Pass NVNT 3-DH1 2480 Ant1 Hopping -45.98 -20 Pass Band Edge(Hopping) NVNT 1-DH1 2402MHz Ant1 Hopping Ref Report No.: TCT210709E014 Page 62 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Band Edge(Hopping) NVNT 1-DH1 2402MHz Ant1 Hopping Emission Band Edge(Hopping) NVNT 1-DH1 2480MHz Ant1 Hopping Ref Report No.: TCT210709E014 Page 63 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Band Edge(Hopping) NVNT 1-DH1 2480MHz Ant1 Hopping Emission Band Edge(Hopping) NVNT 2-DH1 2402MHz Ant1 Hopping Ref Report No.: TCT210709E014 Page 64 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Band Edge(Hopping) NVNT 2-DH1 2402MHz Ant1 Hopping Emission Band Edge(Hopping) NVNT 2-DH1 2480MHz Ant1 Hopping Ref Report No.: TCT210709E014 Page 65 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Band Edge(Hopping) NVNT 2-DH1 2480MHz Ant1 Hopping Emission Band Edge(Hopping) NVNT 3-DH1 2402MHz Ant1 Hopping Ref Report No.: TCT210709E014 Page 66 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Band Edge(Hopping) NVNT 3-DH1 2402MHz Ant1 Hopping Emission Band Edge(Hopping) NVNT 3-DH1 2480MHz Ant1 Hopping Ref Report No.: TCT210709E014 Page 67 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Band Edge(Hopping) NVNT 3-DH1 2480MHz Ant1 Hopping Emission Report No.: TCT210709E014 Page 68 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Conducted RF Spurious Emission Condition Mode Frequency (MHz) Antenna Max Value (dBc) Limit (dBc) Verdict NVNT 1-DH1 2402 Ant1 -36.55 -20 Pass NVNT 1-DH1 2441 Ant1 -35.36 -20 Pass NVNT 1-DH1 2480 Ant1 -35.04 -20 Pass NVNT 2-DH1 2402 Ant1 -37.25 -20 Pass NVNT 2-DH1 2441 Ant1 -35.9 -20 Pass NVNT 2-DH1 2480 Ant1 -35.67 -20 Pass NVNT 3-DH1 2402 Ant1 -36.79 -20 Pass NVNT 3-DH1 2441 Ant1 -36.29 -20 Pass NVNT 3-DH1 2480 Ant1 -34.63 -20 Pass Tx. Spurious NVNT 1-DH1 2402MHz Ant1 Ref Report No.: TCT210709E014 Page 69 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Tx. Spurious NVNT 1-DH1 2402MHz Ant1 Emission Tx. Spurious NVNT 1-DH1 2441MHz Ant1 Ref Report No.: TCT210709E014 Page 70 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Tx. Spurious NVNT 1-DH1 2441MHz Ant1 Emission Tx. Spurious NVNT 1-DH1 2480MHz Ant1 Ref Report No.: TCT210709E014 Page 71 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Tx. Spurious NVNT 1-DH1 2480MHz Ant1 Emission Tx. Spurious NVNT 2-DH1 2402MHz Ant1 Ref Report No.: TCT210709E014 Page 72 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Tx. Spurious NVNT 2-DH1 2402MHz Ant1 Emission Tx. Spurious NVNT 2-DH1 2441MHz Ant1 Ref Report No.: TCT210709E014 Page 73 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Tx. Spurious NVNT 2-DH1 2441MHz Ant1 Emission Tx. Spurious NVNT 2-DH1 2480MHz Ant1 Ref Report No.: TCT210709E014 Page 74 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Tx. Spurious NVNT 2-DH1 2480MHz Ant1 Emission Tx. Spurious NVNT 3-DH1 2402MHz Ant1 Ref Report No.: TCT210709E014 Page 75 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Tx. Spurious NVNT 3-DH1 2402MHz Ant1 Emission Tx. Spurious NVNT 3-DH1 2441MHz Ant1 Ref Report No.: TCT210709E014 Page 76 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Tx. Spurious NVNT 3-DH1 2441MHz Ant1 Emission Tx. Spurious NVNT 3-DH1 2480MHz Ant1 Ref Report No.: TCT210709E014 Page 77 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Tx. Spurious NVNT 3-DH1 2480MHz Ant1 Emission Report No.: TCT210709E014 Page 78 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Appendix B: Photographs of Test Setup Product: TRUE WIRELESS EARBUDS Model: H21B Radiated Emission Report No.: TCT210709E014 Page 79 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Conducted Emission Report No.: TCT210709E014 Page 80 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Appendix C: Photographs of EUT Product: TRUE WIRELESS EARBUDS Model: H21B External Photos Report No.: TCT210709E014 Page 81 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Report No.: TCT210709E014 Page 82 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Report No.: TCT210709E014 Page 83 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Report No.: TCT210709E014 Page 84 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Product: TRUE WIRELESS EARBUDS Model: H21B Internal Photos Report No.: TCT210709E014 Page 85 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Report No.: TCT210709E014 Page 86 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Report No.: TCT210709E014 Page 87 of 87 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com *****END OF REPORT**…

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Page 1 of 2 Appendix B: Photographs of Test Setup Product: TRUE WIRELESS EARBUDS Model: H21B Radiated Emission Page 2 of 2 Conducted Emission