Light Seller In-Car Wireless Bluetooth Receiver & FM Transmitter, Car MP3 Player with Bluetooth Handsfree Calling and Dual USB Charging Port (5V 2A), Perfect for Any Smart Phones (YK-GARG7-GD) 5-in-1 Multifunctional Design: Wireless bluetooth in-car multifunction FM transmitter enables you to do hands-free calls, enjoy clear music, GPS voice navigation, charge your mobile device. Ideal tool for safe driving: With built-in microphone, you can make hands-free calls easily while driving. Easy to use: Pairing your phone and FM transmitter by bluetooth, insert device in the socket, switch to FM radio mode, make sure FM transmitter frequency the same as car's FM, then you can enjoy your music. It is better to choose an empty FM channel for best result. USB Charging ports: Output voltage DC 5V, 2A. You can charge your mobile device when you drive. The USB socket supports USB flash memory disk to play music through your car speaker. There is also a SD card slot so you can play music stored inside the Sd card. Compatible for all smart phones. Compact, lightweight and elegant design - perfectly portable and unobtrusive.