This FM transmitter has all the features you could want. It enables hands-free calls with the built-in enhanced dual microphone for clearer sound, and also allows you to stream music from your phone. You can choose to play your music via Bluetooth, AUX, or USB disk (max 64 GB). You can control your music via the device with buttons on the sides, as well as improve sound quality by pressing the \"bass\" button. The multifunctional rotary knob lets you both adjust the volume and switch between FM stations, as well as accept or reject calls. The transmitter also functions as a fast charger for up to two devices simultaneously. Features: Type: 48W car charger & wireless FM transmitter Input: DC 12-24V QC3.0 output: 5V=3A, 9V=2A, 12V=1.5A PD output: 5V=3A, 9V=3A, 12V=2.5A, 15V=2A, 20V=1.5A PPS: 3.3-11V=3A, 3.3V-16V=2A Total power: 48W Enjoy hands-free calls and music streaming on the go with this versatile FM transmitter and car charger.