This is an upgraded Bluetooth car FM transmitter, which allows you to play music from your phone, USB flash disk and TF card. With built-in mic, it also can make hands-free calls for safe drive. Two USB charging ports let you charge your phone and tablet. Bluetooth FunctionWith advanced Bluetooth module, it supports stream music from your phone or tablet via Bluetooth. It also supports connect your phone automatically after paired successfully for the first time.Hands-free callWith built-in Mic, you can make hands-free calls easily to ensure safe driving while answering calls.Knot ControlAdjust the volume by rotating the knot. The car FM transmitter can turn to the next/previous song easily by forward and back buttons. So buy this product and Save $49 on a VicTsing Car Bluetooth Receiver for $10.99 after instant rebate with free shipping at Rakuten.com.