This is the very cool CASIO CZ-101 Cosmos Synthesizer! Well, only the rich kids could afford a Moog back in the day, so Casio came along with this in 1984 which offered everyone a chance to get in on the synth craze for under $500 (still really expensive in 1984 dollars!). There were just under 70,000 manufactured. I often wonder how many still survive to this day! This is a great little synthesizer and it is working as it should. Note this keyboard has no internal speakers, so it must be hooked up to an amp or headphones or both. It is in good  condition . .. note that there are a couple of scrapes on the display (but as you can see, the display is fine and visible). The best part is that this synth comes with its original operation manual and an extremely rare book -the Sound Synthesis Handbook! You also get the Casio brand power supply. The battery compartment looks clean but I've never used this with batteries. This will be carefully wrapped in bubble and shipped in a sturdy box. All sales final.