1. Latest Bluetooth 5.0 technology: The audio receiver connects to your car's AUXaudio input and pairs with your favorite Bluetooth device to stream your favorite music. Through the built-in microphone, Our devices also allow you to enjoy crystal clear sound quality in all your calls.2. Enjoy wireless music: Even your old speaker can Bluetooth enable the receiver to simply connect wired speakers or speakers with a 3.5mm audio cable and then pair with your phone or tablet, you can enjoy wireless music.3. More options: Carkit's auxiliary receiver allows you to connect 2 Bluetooth devices to enjoy your music and never miss any calls.4. Longer battery life: Immerse yourself in music or conversations up to long 8 hours of playtime and up to 100 hours of standby time, automatically turns off for 5 minutes without Bluetooth connection.