The Yamaha PSR-620 is a 61-key digital keyboard. It is a mid-level keyboard that is suitable for both beginners and experienced players. It has a wide range of features, including a built-in sequencer, a variety of voices and styles, and a range of effects. The Yamaha PSR-620 is easy to use and has a wide range of features. It also has a variety of voices and styles, including piano, organ, strings, and drums. It also has a range of effects, including reverb, chorus, and delay.