Yamaha PortaSound PS-2 mini keyboard. Made in Japan. Features 37 mini keys, 8-note polyphony, 5 preset sounds, 4 preset rhythms, Auto Bass Chord accompaniment, built-in speaker and battery or mains operation. Released in 1980 as part of Yamaha's original PortaSound series. Missing battery cover *Battery terminals rusted, tested with PSU and works great, pots a little scratchy but will come good with use.