1.Strong Compatibility:this Bluetooth V5.3 Receiver Can Add Bluetooth Function To Car/old-fashioned Speaker/projector/amplifier/mixer And Other Devices,Make these wired devices wireless. 2.Unique Surround Sound Function: Enjoy The Surround Sound With High Fidelity From A Normal Audio Source. Its Advanced Internal Chip Takes Charge Of The Conversion To Make It Possible, Using Convenient Lossless Codes. 3.Space-saving Design: Ultra-compact And Lightweight For Convenient Use With A Variety Of Devices. 4.Super Stable Connection: Our Bluetooth Audio Adapter Is Fitted With A Bluetooth 5.3 Chip For Steady Pairing, Fast Transmission And A Wide Signal Range (33 Feet/10 meter). With The U-Disk/3.5mm AUX Port And 2 Rca 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! 5.For Car Kit/Wired Speaker/Home Speaker/Speaker Power amplifier/Headphone ect. PLS Note: Powered By USB Charging (No built-in battery ) We recommend that you use a 5V1A charger to power the adapter to avoid insufficient voltage and current, which may cause current sound or noise when the adapter is in use. It's a Bluetooth audio receiver only, not a transmitter. Can only be used for audio transmission,So you couldn't use it for your keyboard, mouse, file transfer. Product Name: Bluetooth 5.3 Audio Receiver Powered Parameter: DC 5V Bluetooth Version: V5.3 Bluetooth protocol: A2DP/AVRCP Bluetooth distance: 10 meters (Obstacle-free transmission) Audio Interface: R/L 2 RCA/3.5mm AUX/USB U-Disk Frequency range: 10Hz-22kHz Signal to noise ratio:Greater than 110dB Music format: MP3/APE/FLAC/WAV/WMA Colour:Black Material:plastic Package Contents: 1x NFC Bluetooth 5.3 Audio Receive