Wirelessly transfer music and calls from your Bluetooth mobile phone to your car FM stereo system Dual USB outputs can charge two devices at the same time Output current 3.4A, fast charging for tablet phone and most digital products Sturdy and elegant design with a live display Support USB disk, TF card, FM transmitter Built-in microphone makes answering calls hands-free, more safety while driving Small volume, strong structure Wide compatibility makes it universally suitable for 12-24V cars and trucks on the market