The new Piaggero NP series gives you classic Yamaha piano tone and 76 full-sized keys in an ultra-portable package weighing in at just 12 pounds (NP-31). Operating on just 6 AA batteries, you don't even need a power outlet to play your piano anywhere your music takes you. Yamaha has added a new easy to use panel design with dedicated voice-select buttons. Built-in metronome with adjustable tempo and time signature appeals to the pianist who knows that practice makes perfect. The NP31's Graded Soft Touch Action emulates the graded resistance of an acoustic piano without the added weight of hammers.