Product Features: Adopt Bluetooth 5.1 chip design, stronger compatibility and stability. Two-in-one Bluetooth receiving (RX) and Bluetooth transmitting (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 . 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//WAV/DTS/A52/FLAC/AAC/AIF//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 Pro Optical Version Product Model: M16 Pro (without antenna and with 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 Transmission Range: M16 About 10-30m / M16 Pro About 10-20m Support Bluetooth Protocol: A2DP/AVRCP/HFP/ Optical parameter: 192KHZ/25MBPS(Only for M16 Pro Optical Version) Support Music Protocol: MP3/WMA//WAV/DTS/A52/FLAC/AAC/AIF//APE Material: plastic+metal colour: As shown Package Contents: 1 x M16 Pro 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 English User Manual (Note:U-Disk/TF Card not included) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.