Check the listing for details. Nux Npk-20 Digital Piano Black. Color: see description, Condition: New. Listed at 724.94 USD. The new NUX NPK-20 is a powerful, portable digital piano with the NUX WKJ-03 keyboard that offers a natural and optimized playing experience. With 271 high-quality sounds, an arranger function and a dynamic microphone input, it meets the needs of musicians and offers an authentic playing experience with a variety of sound possibilities. With its Bluetooth connectivity, microphone input and various professional effects, the NPK-20 is the perfect tool for versatile musicians. It also allows connection of learning apps via Bluetooth MIDI and comes with the Piano Mate app, which offers a sheet music library. It also offers practical functions such as layering sounds (Layer A and Layer B), splitting the keyboard (Split) and creating user presets. Compact and elegant, the NPK-20 fits int.