Koolertron Compact Mini Size High Power Hi Fi USB MP3 SD Stereo AMP Amplifier Remote Control For Home, Car, Motorcycle, Van, Boat Motor bike And So On Just insert a SD card or USB memory stick, either connect your mobile phone(MP3 files) with USB cable,you can hear the powerful and crystal clear sound with MP3 from this cute little player This device can give you high quality Sound, it can use on Home, Car, Motorcycle, Van, Boat, Everywhere ! RCA Input , can be also input from ipod or other source with 3.5mm RCA cable Mini size easy to installation by DIY, especially good fit for Car , Bike, Boat Marine Remote control up to 5M distance between player; all function advisable (except power ON/Off)