The AD-E95100 from Casio is an AC power adapter that is compatible with several musical-instrument keyboards. It can be used to eliminate batteries and power Casio keyboards (sold separately) from an AC outlet.
The AD-E95100 is compatible with the following models: CTK-1100, CTK-1150, CTK-1200, CTK-2080, CTK-2300, CTK-240, CTK-245, CTK-3200, CTK-4200, LK-120, LK-125, LK-127, LK-160, LK-165, LK-240, LK-247, LK-280, SA-46, SA-47, SA-76, SA-77, SA-78, WK-220, WK-225 XW-G1, and XW-P1.