Casio DG-1 Digital Guitar and Rhythm Machine Used
Extremely futuristic! Casio DG-1 from 1981. This device has 6 nylon strings with 12 selectable sounds and an internal speaker. The tracking is not bad at all, all things considered, and as long as you don't need to bend or tap. The best part is probably the rhythm section which has 12 patterns and a 'fill' button to liven things up. Independent volume controls for guitar sound and rhythm sound.
Runs on 6x AAA batteries or 9v power supply. General cosmetic wear (40 years old!) but nothing major. Working very well.