Bolayu 1.5" LCD Car Kit Bluetooth MP3 Player FM Transmitter Modulator SD MMC USB Remote Equipped with stereo Bluetooth and FM transmitter technology. Adopts call echo cancellation and noise suppression (CVC) technology. Supports Bluetooth speakerphone. Free bluetooth Steering Wheel control. Supports USB flash drive/SD card. Supports external CD, MP3 player audio input. Equipped with caller ID function. Automatically switch from music player to call mode.