1、Rechargeable function (external replaceable lithium battery), no longer have to worry about running out of electricity when going out to play, let alone buy a battery and spend money. 2、Thick design, black keys raised by 9mm [black keys are higher than white keys], making playing more comfortable. 3、Waterproof design of keys and anti‑interference technology avoid trouble of being easily disturbed by outside world. 4、Professional audio structure design, strong dual magnetic speakers, more lifelike, clear and crisp treble, deep bass. 5、Touch function control panel and electronic volume buttons are easy to use and durable. 1 x Roll-up Piano1 x Foot Pedal1 x 3.7V Lithium Battery1 x Power Cord1 x Manual  Condition: 100% Brand NewItem Type: Roll-up PianoModel: PA88Tone 88 Keys (A1-C9) Standard Piano128 Tones, 128 Rhythms, 30 Demo SongsDigital DisplayMaster volume control keySpeed Control KeyMode Selection Keys (tone and rhythm)Recording, OOP, Playback functionsSingle finger chord and multi finger chordStart/stop, synchronous incest function keysDemo songDrum kitKeep Pedal FunctionPower Supply: Built-In 1000 mAh Lithium Battery, USB DC 5V Power Supply