Alesis Recital 61, Stage Piano, 61 Semi-weighted keys with adjustable velocity, 10 Built-in sounds with split function and layering, Polyphony: 128, Effects: Modulation, reverb, chorus, USB-MIDI for use with exercise software or virtual instruments, 6.3 mm Jack input (sustain), Stereo output (RCA), 6.3 mm Jack stereo headphone output, Speakers: 2x 20 watts, Power supply via 6x AA battery or external power supply (12 V DC / 2 A), Dimensions (W x D x H): 904 x 292 x 89 mm, Weight: 7.9 kg, Includes power supply and music stand