CiDoss 1.44 Inch LED Wireless Bluetooth FM Transmitter Adapter Car Kit MP3 Player Music Control Hands-free Call USB Car Charger (Red Light) Support hands-free callin, built-in microphone, play and transmit the music from TF card to car stereo via FM radio signal. Noise cancellation by CVC,wind noise suppression, Full duplex technology. Support A2DP, Play mobile music with high quality once connecting by bluetooth. No need to modify anything in car. Auto pairing once turn it on. Support MP3/WMA/FLAC from TF card. Simger car bluetooth come with car charger, output 5V-2.1A, can charge the device in car.