Function: 1. Rechargeable function (external removable lithium battery), you no longer have to worry about running out of electricity when you go out to play, let alone buy a battery and spend money. 2. Thick construction, black keys 9mm raised [black keys are taller than white keys], which makes the game more comfortable. 3. The waterproof key design and anti-jamming technology avoids the trouble of being easily interfered by the outside world. 4. Professional sound structure design, strong magnetic double speakers, more realistic, clear and clear treble, deep bass. 5. The touchscreen control panel and electronic volume buttons are easy to use and durable. Specification: Item Type: Roll Up Piano Model: PA88 Voice 88 keys (A1-C9) Standard piano 128 voices, 128 rhythms, 30 demo songs Digital display Master volume control key Speed control key Mode selection keys (tone and rhythm) Recording, OOP, playback functions Single finger chord and multi-finger chord Start / stop, synchronous incest function keys Demo song Drum kit Keep pedal function Power supply: built-in 1000mAh lithium battery, DC 5V USB power supply. Package list: 1 x Roll-up Piano 1 x foot pedal 1 x 3.7V lithium battery 1 x power cord 1 x manual