Extend your battery life by using this optional Casio AD12M AC Adapter Power Supply. Recharge your keyboard while you are at home or near an electrical outlet. This equipment plugs you into endless hours of playing. Connect the device into a wall outlet and into the Casio instrument so you will have a continuous power source. This keyboard AC adapter can be used instead of batteries when playing near an electrical outlet. This will give the player the ability to practice for long periods of time, free from interruptions. The Casio Keyboard Power Supply will give you the most out of your sessions with a strong and reliable source of power. This unit us designed specifically for Casio keyboards.