1.Bluetooth receiver adapter,supports to pair with mobile devices (such as mobile phones, tablets) via Bluetooth for audio transport.Make the older speaker devices work like the Bluetooth devices 2.Bluetooth transmitter adapter,you can use it on the TV/computer /TV box/PS/Switch 3.DAC converter,supports signal conversion from digital optical coaxial audio to RCA 3.5mm or R/Lanalog audio 4.U Disk play,no need driver,plug and play ,support MP3/APE/FLAC/WAV/WMA music format 5.Remote control,you can use the IR remote to control the adapter,easy to use. With external antenna,enhance signal, can reach 30M barrier-free transmission distance Product name: DAC Bluetooth Audio Receiver Transmitter Converter Bluetooth version: V5.1 Audio Interface:Coaxial,Optical Fiber,USB U-Disk,3.5MM AUX,R/L RCA Input power: DC 5V Transmission distance: 30m Power supply mode: Type C interface NOTE: Powered By USB Charging (No built-in battery ) Colour:black Material:plastic Package Contents: 1 x Audio Receiver Transmitter 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.