Bluetooth FM transmitter and car charger with dual USB 2.1A. Charge up to 2 devices at the same time thanks to this product, the voltage adapts according to the need of the product. The transmitter remembers the chosen frequency after the first use. When switching on, all you have to do is choose on your car radio, the frequency given by the transmitter (insofar as it is not already used), connect to the device via bluetooth and trigger your music. You can also make your calls with this product in complete safety. The buttons on the transmitter allow you to play the songs (previous or next), intervene on the volume (decrease or increase), answer a call, change radio frequency if unavailable or not clear for example.