Meade Instruments 07576 No.546 25-Foot AC Adapter for ETX-60/70/80/90, DS-2000, NGS and StarNavigator Scopes (Black) Designed for use with the 10-inch LightBridge Truss-Tube Dobsonian Powers telescopes on an AC power source instead of their internal battery systems One side plugs into the wall or an extension cord Acts as the tip of a 9-volt battery Comes with a 1-year limited warranty