Technology upgrade :Bluetooth 5.4+EDR, support A2DP,AVRCP.Transmission DistanceThe 5.4 USB Bluetooth receiver,Stream and control your music with a connection from up to 8 meters. Portable design : Small and delicate, portable features let you carry around, it does not need to download APP and plug and play features easily help you to play you phone music.Wide range of applications: Wireless Audio Adapter used in mobile phones,computer,karaoke,etc.2-in-1 USB Bluetooth Receiver One adapter dual mode, Simultaneously meet the requirements of USB/AUX dual output module.(Note: This Bluetooth is suitable for older speakers, and 99% cars (some cars do not support usb Bluetooth input, so you need to use its AUX input mode)).