1. Car radio: Upgrade your existing car radio system to a multi-functional digital radio + Bluetooth hands-free Qc 3.0. 2. Fast charging: This Bluetooth FM transmitter is equipped with two USB ports. The two fast-charging USB ports support Qc3.0 and 5V/2.5A, allowing you to quickly charge two devices simultaneously. The other port is for USB music playback. It has functions such as making calls, wireless music streaming, playing music from a 64Gb TF card, and charging in the car via USB. There are even more radio stations to choose from in the car, all with clear digital DAB sound quality. 3. Hands-free calling and car charger: Since this Bluetooth DAB transmitter has a built-in microphone, you can make hands-free calls while driving, conveniently answering, hanging up, rejecting calls, or redialing the last number. In addition, there are USB ports that allow you to charge your phone or tablet while driving. 4. Connection method: It can be connected to your existing car audio system through a simple auxiliary input cable (included), or connected via an unused FM transmission frequency.