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 daysSupport 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 AdapterProduct version:M16 Pro Optical Version Product Model:M16 Pro (without antenna and with optical fiber)Bluetooth Version: Bluetooth V5.1Battery Capacity:3.7V/1200mAh(UN38.3)Input Parameter: DC 5V-1A(MAX)Charging Time: About 1.5 hours vaorloUsing Time: Listen to music for about 8hours and stand by for 30 daysTransmission Range: M16 About 10-30m / M16 Pro About 10-20mSupport 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//APEMaterial: plastic+metalcolour: As shownPackage Contents:1 x M16 Pro Bluetooth Audio Adapter1 x 3.5mm Aux Cable1 x RCA Audio Cable1 x Type-C Charging Cable1 x Remote control1 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.