Vintage Casio Casiotone MT-520 Synthesizer Electronic Keyboard. The keyboard has been tested and in great working order. All buttons and dials are fully functional. All of the drum keypad buttons are functional. I tried using an after-market 9v power adapter, and it wouldn't power on. The 6 D size batteries, when installed, the keyboard works great! Batteries will be included and will be ready to play upon purchase. The keys have some minor wear to them, and it looks like there may have been some letters written on the keys. Condition is Used. Shipped with USPS Ground Advantage.