Function: MP3 Player + Rearview Mirror+FM Radio Music file format: MP3 file format Music broadcast mode: Supporting SD /MMC / TF card or USB Drive to play music Key function: Previous, Next, Pause, Volume regulating, FM searching, on/off Shell rim color choice: Silver, Red, Black With automatic memory function HI-FI and Stereo design Digital circuit design, high efficiency and energy saving, low power dissipation Fashion design, waterproof and shakeproof New features: Able to charge their cell phones, support for external audio input. Applicable models: Application of various Prince car motorcycle