Features: 100% BRAND NEW! Built-in speaker, chargeable with battery (not include) Rolls up for easy storage&travel Touch sensitive mat Headphone out: 3.5mm(headphones not include) Fully-adjustable, illuminated volume control Sweet-sounding internal speaker Soft, ultra-pliable keys ( silicon-rubber / ABS resin ) Specifications: Keyboard: silicon waterproof keyboard, Tone: 129 kind of tones. Rhythm: 100 rhythm. Demo: 80 songs MP3 player function: MP3 on/off, MP3 Volume, play and pause. Language learning function: repeat, read, compare Interface: USB MIDI and USB charging interface,MP3 USB interface, earphone, sound box and sustain pedal interface. Power: MultI-in high capacity polymeter environmental satety li-battery, rechargeable, and able to connect DC 5V power adaptor.