The FM transmitter has a digital display and audio jack to connect directly to your vehicle's auxiliary port using a 3.5mm Aux cable (not included). Its 12w USB-C charging port helps to fast-charge your device. You can also simultaneously charge a second device with the 12w USB-A port. A perfect and handy device for your charging needs on the go._HFP Bluetooth hands-free callingFM Frequency: 88.1- 107.9 MHzInput power: 12-24V--3AUSB outputs: 5V,2.4A-- 5V,2.4ATwo USB portsUSB-A and USB-C ports