The Np12 is a new 61-key model that takes Piaggero's signature concept of Slim, Light, and Compact to a new level, offering a wide variety of uses with simple, user-friendly functions. Advanced Wave Memory (Awm) Stereo Sampling Awm, Advanced Wave Memory Stereo sampling is a sampling system that mirrors the sound and expression of the original instrument using advanced digital technologies. It creates a unique, rich sound through the artful commingling of multiple waveforms. Stereo Speaker System The NP 12 uses an efficient stereo amplifier that generates a solid sound in this slim, light and compact digital piano. Warm, round bass and clearly articulated treble result in a depth of sound and color that will charm you and keep you platying for hours. Piano Preset songs The P12 also contains performance data for piano songs as well as voice demo songs, for your listening and play-along pleasure. Battery Power or AC adaptor The Np12 can be used with an AC adaptor or with batteries (the 6-hour battery life is the key to Piaggero portability). It also has a function that turns off the power automatically if the keyboard has not been used for 30 minutes in order to avoid using power unnecessarily. This also supports long battery life.