Extend your battery life by using this optional AC adapter while you''re at home or near an electrical outlet. Works with Casio LK-30, CTK-520L, CTK-560, LK-33, CTK-560L, CTK-431, CTK-495, CTK-531, CTK-631, CTK-620L, CTK-611, CTK-541, CTK-533, CTK-451, CTK-651, CTK-731, CTK-511ADMB.