The PT-87 contains six sounds: violin, celesta, organ, trumpet, harpsichord, clarinet, piano, and flute. It can play songs from Casio ROM packs.
It takes 5 AA batteries or a 7.5 volt power adapter (casio AD-1) and lacks an audio output. It's easy to add an audio output if you're familiar with soldering. You can add a line out connection by soldering an audio out jack to the red and blue wires leading from the tone generation section to the amplifier section. This will result in a line-level audio output without interfering with the built-in speaker.
Keyboard: 32 mini keys
ROM: 8 sounds, 12 rhythms
Power Consumption: 1.2 watts
Dimensions: 408 mm x 139.5 mm x 36.5 mm
Weight: 0.75 kg
This keyboard has built-in 0.6-watt mono speaker(s).
Batteries: AA x 5
Casio PT-87 Original Manual ($4.99)
Casio PT-87 80s ($50)