Be sure to add me to your favorites list CASIO Car / Automobile DC Power Supply for Casio Portable Keyboard Instruments and More. This is an unusual piece for Casio keyboard players on the go! It's a DC to DC power supply that works perfectly for Casio (and many Concertmate models) portable electronic keyboards that accept DC 9V with (-) plug, which MANY of the Casio models need. This is a genuine Casio brand CA-K90, 9 volt 900 mA (-) output, for use in your car's power / cigarette lighter plug. You can save a bundle on batteries by just plugging this into your car's power / cigarette lighter plug when you want to play your Casio (and some other makes, especially many Concertmate models, which are often re-badged Casio instruments) when in a car, truck, suv or van ... Just please don't try to play and drive at the same time ... THANKS FOR LOOKING AND CHECK OUT MY STORE!