Can be used for Digital to Analog Audio Converter, This Digital to Analog Audio Converter is designed for either home or professinoal audio switching.It converts SPDIF Toslink digital/Coaxial audio signals to analog 2RCA L/R audio and 3.5mm AUX and available for connection to an external device such as amplifier via standard style/3.5MM aux jacks.This Converter is small in size and quite easy to install. Multi-function Bluetooth transmitter & receiver, In TX Mode: Transfer your music from a TV, CD player, , laptop to a Bluetooth headset or stereo; In RX Mode: will transfer the music in your mobile phone or computer to the audio, so that you can enjoy HIFI CD freely The sound quality. Wireless Music Streaming: Stereo stream music to non-Bluetooth headphones and speakers. Super Stable Connection: Our Bluetooth audio adapter is fitted with a Bluetooth 5.0 chip for steady pairing, fast transmission and a wide signal range (33 feet). With the 3.5mm AUX port or port, it can be connected to non-Bluetooth car audio systems, home stereo, wired headphone/speaker, Amplifier/Home Theater.etc. Then you can enjoy wireless Hi-fi music streaming! Connect two devices: Support to connect with 3.5mm audio port and 2 audio port at the same time. Auto-Connect: This Bluetooth receiver will automatically connect to the last paired Bluetooth device when you turn it on time. With Bluetooth antenna, So the sound transmission is more stable,no-noise, and more synchronized/low latency. Upgrade-KEY Button to TOUCH SCREEN : Next song/Volume Up, Previous Song/Volume Down, Multifunction Button() With LCD screen display , it's can be show mode status and bluetooth select ; more clear. Note: No built in battery,So POWERED BY USB CHARGING. In bluetooth transmitter mode, its support 3.5mm/digital fiber / coaxial /3.5mm input,compatible for most of devices. Support volume adjustment and song switching. Parameter: Product Name: Multi function Bluetooth adapter Product Model: T38 Bluetooth Version: Bluetooth V5.0 Battery: Do not bulit-in battery (Powered by usb charging) Transmission Range: 10m (barrier free) Interface: 3.5mm AUX/COAXIAL/OPTICAL/ Support Protocol: A2DP/AVRCP// Using : Drive free Basic Functions: Bluetooth receiver, Bluetooth transmitter, touch screen key operation, digital fiber / coaxial /3.5mm input, led display. Support Devices: All kinds of car, speakers,desktop computer, laptop, TV, power amplifier,projector etc. Colour: black Material: plastic Package Contents: 1 x Wireless Adapter 1 x 3.5mm AUX Audio Cable 1 x Optical Fiber Cable Cable 1 x Type c Charging Cable 1 x audio cable 1 x English Manual Only the above package content, other products are not included. Note: Light 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.