All the keys on the keyboard work! And all the other functions! Rare vintage Casio PT-7 from the 1980's.
Features 29 soft touch foil keys, a very thin detachable keyboard, built-in speaker. 6 preset rhythms: waltz, samba, swing, slow rock, pops, rock. 8 preset synth sounds: piano, electric piano, organ, pipe organ, harp, accordion, clarinet, violin. 2 jacks for AC adapter AD-1 7.5V (not included) 2.0W & headphone. Measures approximately 9.5" long by 4.75" tall.5 AA batteries (not included)the only issue i could find is on of the springs in the battery compartment is smaller that the others.