Features: Fm transmitter: transfer music from mobile phone, U disk, TF card, MP3 to car audio player Car charging: You can charge the phone/iPad smartly via the USB interface. Bluetooth Car Handsfree: The phone can be used for hands-free calling via Bluetooth. Car USB: You can read the U disk through the USB interface, or read the TF card in the card slot. FM transmitter Indicator display window Independent Bluetooth start/stop button Line audio input Support for playing music on a USB flash drive Support MP3/WMA music format Hands-free, answer/end/reject/re-dialing via Bluetooth one-touch Bluetooth stereo music playback, transmitted to the car stereo via fm. Call echo cancellation and noise reduction (CVC) technology USB output voltage, which can supply voltages up to 5V/2.5A to other devices