Casio, PT-20 Electronic Musical Instrument Mini Keyboard with 29 Keys. The PT-20 has automatic accompaniment with chord notes and modifiers. It features a tuning wheel on the back that allows precise tuning changes if needed. Year of issue: 1982 Keyboard: 29 keys ROM: 7 sounds, 17 rhythms Power consumption: 1 watt Including origional soft case. In 1982, Casio began its PT mini-keyboard series with the launch of the Casio PT-20. It was the first mini-keyboard in the series. It was the first mini-keyboard with polyphonic accompaniment (played via special "string keys") that could also be stored and edited in the built-in sequencer. The sequencer also had another unique and totally odd feature, called "Arranger Harmony": the correct chords could be automatically created for a melody stored in the sequencer! (This feature was revived in the mid-90s by the Casio VA-10). Dimensions: 34.5 cm x 9.5 cm x 3 cm Batteries included Good cosmetic condition, see photos that form part of the description. Battery holder without rust. Year of publication: 1982 Keyboard: 29 keys ROM: 7 sounds, 17 rhythms Power consumption: 1 watt Dimensions: 345 mm x 95 mm x 31.7 mm Weight: 596 g This keyboard includes 0.5-watt mono speakers. Works perfectly on battery's - No supply included. Will be packed very carefully & quickly shipped.