Features Multi-functional Design: The Car FM Transmitter is able to play music And show up the voltage. With TF card slot and USB port, it is also able to play and transmit music files from TF card or USB disk. Fast and Intelligent Charger: This Bluetooth Car charger comes with USB output 5V/2.5A and it is able to charge devices fast. It will automatically provide the matching output according to the situation. Hands Free Calling:Simply pair this car transmitter with your phone first. You will be able to answer/reject/end calls easily. Hands free system can set free your hands during answer the calls and let you enjoy in safely drive. Perfect Compatibility: compatible with all bluetooth-enabled devices, such as iPhone, Ipad, Samsung, LG, HTC smartphones, tablets, etc. Noise Reduction Technology: using CVC technology, this car FM transmitter provides you with clear phone calling and let you enjoy beautiful music. It also supports A2DP (Advanced Audio Distribution Profile).