Product Features: Adopt Bluetooth 5.1 chip design, stronger compatibility and stability. Two-in-one Bluetooth receiving (RX) and Bluetooth mitting (TX). Built-in DSP decoding chip, heavy bass effect, supports three levels of adjustable gain. Upgrade the NFC function, and the mobile phone sensor can be connected with one touch. Controllable indicator light, soft and not glaring, the brightness of the light increases/decreases accordingly with the volume. Built-in 1200mAh rechargeable lithium battery, continuous listening to music for about 8 hours, battery life up to 30 days Support U disk/TF card playback and launch, support MP3/WMA/SBC/WAV/DTS/A52/FLAC/AAC/AIF/AMR/APE format. Support 5~8 meters red private model external remote control, mode/signal/volume/up and down song/mixing/microphone and other operations.(NOT SUPPORT POWER ON). Built-in 6.5mm high-definition microphone, which supports microphone access for singing, and built-in anti-howling design. Product Specifications: Product Name: Multi-function Bluetooth Audio Adapter Product version:M16 Antenna Version Product Model: M16 (with antenna and without optical fiber) Bluetooth Version: Bluetooth V5.1 Battery Capacity:3.7V/1200mAh(UN38.3) Input Parameter: DC 5V-1A(MAX) Charging Time: About 1.5 hours vaorlo Using Time: Listen to music for about 8hours and stand by for 30 days mission Range: M16 About 10-30m / M16 Pro About 10-20m Support Bluetooth Protocol: A2DP/AVRCP/HFP/SBC Optical parameter: 192KHZ/25MBPS(Only for M16 Pro Optical Version) Support Music Protocol: MP3/WMA/SBC/WAV/DTS/A52/FLAC/AAC/AIF/AMR/APE Material: plastic+metal colour: As shown Package Contents: 1 x M16 Bluetooth Audio Adapter 1 x 3.5mm Aux Cable 1 x RCA Audio Cable 1 x Type-C Charging Cable 1 x Remote control 1 x Bluetooth Antennae 1 x English User Manual (Note: