Donner DEP-1S Semi Weighted Keyboard Digital PianoDonner DEP 20 Donner DEP 1S Donner DP 10 Keyboard Type Fully Weighted Hammer Action Keys 88 Keys Woode Semi Weighted Digital Piano 88 key semi weighted keyboard Number of Polyphony 128 64 32 Amplifiers 25W*2 15w*2 10W*2 Key Cover Number of Voices 238 128 128 Number of Rhythms 200 100 128 Number of Songs 100 88 21 Another Funtion Dual Tones, Dual Keyboards, Single Finger Chords, Multi Finger Chords, Synchronized Start, Intensity Adjustment (3 types),