The FM transmitter is a bluetooth device that allows you to play music or make phone calls hands-free while driving. The device is equipped with a USB adapter, so you can charge your phone while using it. The FM transmitter also has a built-in microphone for making calls and a stereo sound system for playing music. The device is compatible with both iOS and Android devices. The FM transmitter has a safe chip that prevents damage to your car's electrical system. It is easy to install and use and it attaches to the vents of your car. It also sports an LCD screen that displays the battery voltage, call status, and song information. That's not all, it has ambient lighting to create a soft, calming sense of ambience in your car.