BASEUS Dual USB Ports Bluetooth Car Charger with Current Display Support MP3 TF Card/U Disk/FM Transmitter for samrt phone Wirelessly transmit music and calls from Bluetooth mobile phone to the car FM stereo system Dual USB outputs can charge 2 devices at the same time 3.4A output current, rapid charging for phone tablet and most digital products Strong and elegant design with current display Support USB disk, TF card and FM transmitter Built-in microphone makes answer calls hands-free, more driving security Compact size, sturdy body construction .