Annbully Mini USB Bluetooth 4.0 Receiver A2dp Wireless Music Streaming Sound System /Bluetooth Car Kits with 3.5 Mm Stereo Power supply:usb 5V power supply;Use for Home Theatre, Mobile Phone, Karaoke Player, Computer, Stage. Easy To Operate:Simply connect your speaker with our device,immediately transform your speakers into a fashionable wireless speaker Wireless Play:Removing troubles of wired connection,through the wireless connection and transmission,the user can enjoy a high fidelity music at any place indoor by wireless control Transmission Rate:3(Mbps) . Transmission Distance: up to 15m; version:V4.0 and support A2DP technology. Compatible with any car stereo speaker or portable speaker with 3.5mm audio socket or USB audio receive port. can let you carry them to anywhere you want.