Casio AD-12M AC Adapter Power Supply Extend your battery life by using this optional AC adapter while you're at home or near an electrical outlet 12V Adapter for CTK 5000, WK 500 / 3300 / 3800, CDP 100 / 200, PX 100 / 110 / 120 / 200 / 300 / 310 / 320 / 400R / 500L / 575R / 700 / 720