Uekars FM Transmitter is a combination of Bluetooth FM transmitter and USB car charger which could be used in any cars with 12V-24V Cigarette socket. Bluetooth FM Transmitter: Transmit music from bluetooth device such as smartphone / tablet to car FM stereo system by Bluetooth which is much cheaper than buying a Bluetooth car radio. Experience Clear Hands-free Calling Adopting CVC noise reduction technology, our FM transmitter with highly sensitive microphone enables you to communicate with others easier. Play Music in 3 Ways 1.Bluetooth connecction. 2.USB flash disk that can up to 64G. 3.Aux-input makes easily stream music from MP3, MP4 and other audio devices with 3.5mm port. Easy to switch between Bluetooth, USB disk and Aux-in mode with one button. Clear Sound Compared with those Bluetooth 3.0 FM transmitters, our Bluetooth 4.2 FM transmitter ensures more stable signal transmission and promotes clarity for enjoying both music and hands-free phone call. Charge Your Devices Easily With a 5V/3.1A dual USB charging port, you can charge your phone or other devices in fast speed but safe. Auto Reconnection The FM transmitter will automatically connect with the last paired smart device when turned on next time. (Please turn on your smart device's Bluetooth function first, and then turn on the product.) Compact and Portable Unlike those bulky transmitters, our FM transmitter is more smaller and more space-saving, fitting your car cigarette lighter easily for safe driving. Easy to Use 1. Choose a blank FM frequecy from car radio (87.6-107.9Mhz). 2. Set this Bluetooth FM Transmitter car kit to that same blank FM frequecy for connecting to car stereo system.