Enjoy hands-free calling: Provides a stable connection, echo cancellation can reduce background noise, and achieve better hands-free calling, so you only need to press the button to answer calls.Bluetooth: Provides a more reliable and faster connection, allowing you to make phone calls, play music, or get driving directions without occasionally disconnecting. The Bluetooth FM transmitter supports voice assistance.Wide compatibility: Bluetooth car FM transmitter can be paired with all Bluetooth enabled devices as a hands-free kitBluetooth connects to your car radio through FM channels, and then you can play music to the car stereo from your Bluetooth device/USB. Built in overcurrent/overheat/short circuit/overvoltage/high temperature protection devices ensure stable current output.Widely used: When playing music, rotating to the right for a long time can adjust the volume, and rotating to the left for a long time can continuously decrease the volume. Short press the dial key while playing music to play/pause the music. Suitable for most car models