Yamaha PSR-E333, 61 keys, USB, 10.8 lbs (4.9 kg), 10 W, 37.2 x 14.5 x 5.2" (945 x 369 x 132 mm), 12V DC Yamaha PSR-E333. MIDI-keyboard number of keys: 61 keys. Interface: USB. Weight: 10.8 lbs (4.9 kg). Power consumption (typical): 10 W. Dimensions (WxDxH): 37.2 x 14.5 x 5.2" (945 x 369 x 132 mm), Power requirements: 12V DC