Keku Wireless Car Hands-Free Calling Kit for Smartphones with Bluetooth 3.0 FM Transmitter, Charger Adapter and Cigarette Lighter This is a new Bluetooth MP3 Player FM Transmitter Hands-free Car Kit Charger, which support USB driver and Micro SD card and can automatically play and transmit the MP3 files of USB driver and Micro SD card after matched with your radio by the frequency. Very easy to pair up your phone with the Bluetooth FM Transmitter and its hands-free system can set free your hands during answer the calls and let you safely drive. high-performance built-in microphone which can offer your clear talking and wonderful music. 5V/500mA USB charging port to charge your portable devices,Voice promprs the caller number when a Call comes in.And when you plug it in the car,it will show the volt of battery.DC 9-26V. Compatible Modes: IPod/iPhone 6 6 plus, Samsung, iPad, HTC,FIRE,Nokia and other mobile devices