Item Type: 88 Keys Roll PianoMaterial: Silicone, ABSBattery Type: Lithium Battery 1100mAh (Shipped with built in battery)Body Size: Approx. 23 x 9.5 x 2.5cm / 9.1 x 3.7 x 1inKeyboard Size: Approx. 125 x 16 x 1cm / 49.2 x 6.3 x 0.4inFunction Introduction: LED digital display, automatic sleep function, 128 tones, 128 rhythms, 14 demo songs, colour, rhythm mode selection keys, recording, programming, playback functions, demo song singing, teaching functions, start, stop , Insertion function, piano, keyboard drum function, , vibrato function, master volume control, speed control function, MIDI OUT, USB 5V power supply function, foot switch port, headphone, audios output port