1?��88 KEYS: Flexible roll up piano is a standard piano with 88 keys (A1 to C9), with Bluetooth MIDI function to connect to APP, suitable for all ages. 2?��MULTIFUNCTION: roll piano has 128 tones, 128 rhythms and 30 demo songs, support easy recording, editing, playing, extension, vibrato, teaching and chord functions. 3?��LED DIGITAL TUBE DISPLAY: Roll out piano with LED digital tube display, support MIDI output can be used with computer or tablet connection. 4?��WITH HORN: roll up keyboard piano comes with horn, can be played independently, support external sound or headphones, can be connected to the external extension pedal. 5?��POWER SUPPLY: 88 key roll up piano can be powered by rechargeable lithium battery, external DC5V power supply or mobile charger power supply.