The NUX WK-400 is a digital piano that features 88 hammer-action keys with adjustable touch response for a realistic piano playing experience. It has a polyphony of up to 192 notes and comes with 20 voices, including grand piano, electric piano, strings, and organs. The piano also includes a 3-track recorder, metronome, and a variety of effects such as reverb, chorus, and EQ. The built-in speakers provide powerful sound, while the headphone jack allows for silent practice. It also includes MIDI connectivity for use with music software and USB storage for recording and playback. The piano is sleek and modern in design and comes with a matching bench.