Casio AD-12MLA(U) AD12M3 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