Studioplays Gravity bluetooth speaker made of oil based outer shell. Features: Power button, Pause button, Forward/previous button, 10 hour play time. 3-4 hour full charge, Max 32G SD card port on bottom slot, Turns off 10 min if not being used, Mimi USB2.2 USB 1.1 charging compatible, 3watt output power, Music format MP3,WAV,WMA,APE,FLAC.