The Yamaha PA3C saves money - why keep buying expensive batteries when you can take advantage of low-cost AC power at home.The PA3C AC power adaptor plugs directly into a 120V - AC electrical outlet. The PA3C is convenient. It comes equipped with a 6 foot cable that plugs directly into your instrument. It gives you reliable power. The PA3C is Yamaha's standard model (700mA at 12V output). It works with all Yamaha products that require 12V output and 700mA (or less). Please refer to the power requirements that are usually stamped next to the power input socket on the instrument. Works with PSR270 and lower, DGX202 and EZ20, YPP35, DD50, DD9M & others.