High-end appearance, hand-rolled keys, original piano sound quality Keyboard: 88 standard keys128 tones, 128 rhythms, 20 demonstration songs LED digital tube displayWith speaker, external speaker, headphones and other amplifier devices, external sustain pedal Bluetooth APP teachingMIC microphone functionLithium battery charging jack and device MIDI transmission function can be connected to cell phones, MP3, computers and other audio input functionFunction keys: Demonstration/Start/Stop function keys Recording/Playback function keys Tone/Rhythm/Speed/Shift Tone control keysChord / sustain / vibrato Sync/Insert function keys Keyboard drum/metronome functionProgramming/teaching functions Sound effect comparable to real pianoTechnical parameters.Material: natural silicone + ABSPower input: DC5V/1000mAAccessories.Power adapter, USB data cable, lithium battery, pedal, manual.Function keys.Demonstration song/start pause function key, recording/playback button, /tone/rhythm/speed/shift tune.Volume control keys / chords / delay tone / vibrato / synchronization / insert function keys / keyboard drum / metronome function /Programming/teaching function/acoustics comparable to real piano