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. 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 Possible, Using Convenient Lossless Codes. 3.Space-saving Design: Ultra-compact And 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 mission And A Wide Signal Range (33 Feet/10 meter). With The U-Disk/3.5mm AUX Port And 2 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 . 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 mitter. Can only be used for audio mission,So you couldn't use it for your keyboard, mouse, file fer. 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 mission) Audio Interface: R/L 2 /3.5mm AUX/USB U-Disk Frequency range: 10Hz-22kHz Signal to noise ratio: 110dB Music format: MP3/APE/FLAC/WAV/WMA Colour:Black Material:plastic Package Contents: 1x NFC Bluetooth 5.3 Audio Receiver Adapter 1x AUX Audio Cable 1x Type-C Power Cable 1x Audio Cable 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.