Fast Charge Handsfree Wireless Bluetooth Car Kit FM Transmitter Radio MP3 Player Dual USB Charger Interface:USB 3.0; Connection:USB, Bluetooth; Card Port:TF Port; Type:Bluetooth Car Kit; Compatible Vehicle Brand: universal; Function: FM Transmitters, Car MP3 FM Modulator, Bluetooth, FM Radio, MP3, Automatic Adjusted Current,Short Circuit Protection; Bluetooth Version:Bluetooth 4.2; Compatibility:Car,Motorcycle; Production mode:Self-produce; Special selected products:COD - USB1: 5V/2.4A - USB2: 5V/3A - TF: 32G max(Not included) - LCD display screen clearly show car battery voltage level while the car starts.