Product parameters: 1. Bluetooth solution: 5.0 , A2DP, , AVRCP2. Frequency: 2.4GHz-2.48GHz3. Charging voltage: DC 5V4. Bluetooth receiving function: connect 1 mobile phoneUnique 3D Surround Sound Function: With the 3D audio button, you can switch to 3D mode to enjoy the surround sound with High Fidelity from a normal audio source. advanced internal chip takes charge of the conversion to possible, using convenient lossless codes. Auto On When you connect to the power, So good for to use in car or other you it have auto on functions.Dual Device Link: Simultaneously pair your smartphone and tablet and music from either one with any stereo system that supports a standard 3.5mm or RCA .Connect two Bluetooth devices at to listen to music, make phone calls, and more.Connect three devices: Support to connect with 3.5mm audio port , coaxial audio port, optical fiber port.Wireless Music Streaming: Stereo music to non-Bluetooth headphones and speakers.Space-Saving Design: Ultra- and lightweight for convenient use with a of devices.Super Stable Connection: Bluetooth audio adapter is fitted with a Bluetooth 5.1 chip for steady pairing, fast transmission and a wide signal range (33 feet).Auto-Connect:This Bluetooth receiver will automatically connect to the last paired Bluetooth device when you turn it on the time.Upgrade-KEY Button: song/Volume Up, Previous Song/Volume Down, Multifunction Button()Upgraded to support SD Card play.Note: No built in battery,So POWERED BY USB CHARGING.Color: black + orange red: ABSPackage Contents:1x Bluetooth 5.1 Audio Receiver Adapter1x 3.5mm audio cable1x coaxial audio cable1x Optical audio cable1x Type C Charge Cable(The computer display is different, the product may have color difference)Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.