FAVOLCANO Bluetooth Wireless MP3 Player Music Control FM Transmitter Hands-Free Calling Car Kit Charger Talk A2DP USB SD MMC with Steering Wheel Control A built-in microphone with enhanced voice detection makes hands-free calls easy. Plug-in, sync your phone, and you're ready to talk. It also has a built-in microphone with voice detection, so every conversation comes out clear. The hands-free tech in the FM transmitter allows the user to make & receive phone calls while driving. The FM tuner also comes with an Auto-seek feature to help find the clearest FM station. A universal USB port lets you charge your Smartphone or MP3 Player while streaming, so you can power up while you're talking or listening to music Perfect for your non-Bluetooth devices, use the included 3.5 aux cable to plug into the Line-In port of the FM transmitter, then transmit your music without worrying about adapters, tapes or CDs.