USER'S MANUAL MODEL: CM-223 Thad you for chopping CM-223 Solar FM Transmitter which is dedicated for gars, This product uses a high-performance Bluetooth module and audio decoding chip, supports AUX input and comes with a remote control, Supports Type-ยข cable and solar charging, Not only it can connect the music from the mobile phone to the car stared through Bluetooth, it can lags play music files in flash drive or TF card and transmit it to the car stereo witlessly.