AVANTEK Bluetooth FM Transmitter, In-Car Universal Wireless Radio Adapter Hands-free Car Kit with TF/Micro SD Card Slot and USB Car Charger (MM36) Plug-and-Play: Adapter wirelessly pairs with various Bluetooth enabled devices (smartphones, iPod, iPad etc.) and transmits crystal clear sound to your car stereo. Built-in 3.5mm audio adapter enables music streaming from devices not supporting Bluetooth. The power-off memory stores the last FM frequency for automatic connection when turned on. Simply plug in, sync the frequency, and you're ready to enjoy superb audio quality. Hands-free Calls with Bluetooth: The hands-free technology allows the user to safely make and answer calls with just one click. Tap the multifunction button twice to redial the last phone number, or hold it for 5 seconds to reject an incoming call. The high-sensitivity built-in microphone, with enhanced voice detection, makes hands-free calling easier and clearer. USB Charging Port: The USB charging port with 5V/2.1A output enables you to quickly charge your mobile phone, iPad, tablet or other portable devices, so you can conveniently power up your devices while you are talking or listening to music. Enjoy worry-free on-the-go charging of your devices while driving. TF/Micro SD Card Slot: Reads files directly from a TF/Micro SD card. Plays and transmits music to your car stereo with high quality sound from the FM radio signal. Also supports various other formats, including MP3, WMA, WAV, and FLAC. Large LCD Screen: The amazing 1.44 inch LCD screen displays FM channel, volume, car-battery voltage, song titles, or the caller ID. Control your music and make calls with ease!