This FM transmitter car MP3 player is equipped with professional and high-performance MP3 decoder chip, which can transmit music files on your smartphone or TF to your car stereo wirelessly. Simple operation brings you instant music enjoyment. Just plug and play, turn your car FM radio on, find an empty frequency, and match it to this transmitter. Features - Color: Golden. - Material: ABS. - Size: Approx. 9.8 x 9 x 3 cm. - Input Voltage: 12-24V - USB output: 5V / 2.1A. - FM: 87.5MHZ-108.0MHZ - hands-free calling. Supports answer, up, reject, and other functions. Seamlessly switches between music playing and hands-free mode. - FM transmitter. Stream music and calls directly from your mobile devices to car stereo system via FM radio signal. Just plug this FM Transmitter into cigarette lighter socket of your car directly, plug and play. - Echo cancellation and noise control (CVC) technology ensures fluent and clear call communication. - Support TF memory reading and playing music files on MP3/WMA format. - Support USB output, with 5V 2.1A charging ports, provide aster charging for mobile phones and tablets.