Car Bluetooth FM Transmitter, YOKKAO Wireless Bluetooth MP3 Player Hand-free Car Kit Charger Built-in Mircrophone with USB/TF Ports for Smartphone Devices BUILT-IN FM TRANSMITTER - Wireless transmit phone call from Bluetooth mobile phone to the car FM stereo system. With FM transmitter, full frequency: 87.5-108.0MHZ. Plug the FM transmitter into your vehicle's cigarette lighter or power port, enjoy your music time. MULTI-FUNCTIONAL - This bluetooth FM transmitter can not only be used to play music. With built-in microphone, it also provides you with an amazing hands free function. You can answer and hang up the phone. It also support A2DP function. Music will be played directly while the mobile phone is connected. MULTIPLE INPUT WAYS - It support USB disk and TF card, can play music files in MP3/ WMA format. Works well with Android and other mobile phones. USB ports also can be used to charge your phone. EASY YOUR LIFE - Simply paired your phone with the Bluetooth FM transmitter and let you safely drive while answer the phone. Noise and wild suppressed by CVC technology to create full duplex sound quality, built-in microphone which can offer you clear talking and wonderful music. ATTENTION - Please don't choose frequency that has local radio station to avoid interference. It might be unable to read your micro SD card if there are too many things in your card.