BLUETOOTH 5.0 RECEIVERThe latest Bluetooth 5.0 technology ensures a stable connection between your phone and the non-Bluetooth audio player (with 3.5mm AUX port) like car stereo, wired headphones. PAIR 2 DEVICES AT ONCEThe portable Bluetooth receiver can pair with 2 devices at the same time. You can enjoy your music without worrying about missing a call. Once paired, the car stereo will automatically reconnect to your last paired Bluetooth devices, as long as they are within wireless range. HANDS-FREE CALLSThe J19 Bluetooth audio adapter provides approximately 10 hours of non-stop wireless music streaming or 10 hours of speaker phone calls while driving, taking care of your driving safety and getting rid of boring long car trips. PLUG & PLAY AND EASY TO USE One touch power on/off, expanded volume/track button to control volume and easily skip track, answer/hang up and play/pause music via center button WIDE COMPATIBLEBluetooth 5.0 receiver compatible with most smartphones, ideal for home or vehicle audio systems. (Like: speaker, earphone, etc.).