Portable Roll Up 88 Keys Piano Keyboard with LCD Display, Digital Electric Hand Roll Piano Keyboard with Rechargeable Battery (88 Keys) Tips: Please fully charge the piano before your first use. Electric Keyboard Piano Function: 4.3in LCD screen Built-in Rechargeable Battery Sustain Pedal - Tremolo function 128 tones - Real grand piano sound quality Built-in 4D stereo speakers MIDI FUNCTION Roll Up Piano Specification: Keys: 88Tone:128Rhythm: 128Demonstration song: 15Material: SiliconSize: 53inchBattery: RechargableScreen: 4.3inch LCD Portable Piano Package List: 1 x Roll Up Piano1 x USB Charging Cable1 x Sustain Pedal1 x Instruction Book 4.3inch LDC Screen This roll up piano is designed with 4.3inch LCD screen: Speed of sound, Music beat, Staff, Demonstration song. Thicken Filled Silicone Portable keyboard piano, with thickened original silica gel filling, Wouldn't advise parents to purchase this for their student musician if they are taking private instruction BUT if you simply want to expose your child to piano music then it's a good introductory device. Easy to Clean Silicone keyboard is waterproof and can be washed, you can use sticker to stick the dust. Sustain Pedal An extra sustain pedal is included for you. 2000mAh Rechargeable Battery This electric piano can last for 36 hours with built-in rechargeable battery. It can be charged by AC power supply or power bank. Dual-core Piano Chip Designed with dual-core piano chip, this roll up piano responds quickly,it can effectively avoid the legato problem . 4D Stereo Speakers With built-in 4D stereo speakers, this portable piano is pure tone sampling,high-fidelity sampling rate to feel the real grand piano sound,full bass, bright treble. Portable Keyboard Piano Roll up piano made of high quality silicone ,nontoxic,wear resistance,soft and durable,it can be rolled up to a small size, easy for you to store or carry out. Record/Play Function; Transpose Function; Synch Mode; Vibrato Function; Programming Mode; Teaching Mode; Chord FunctionTEMPO+ Function; Metronome Function; MIDI Function