... board1, Inpout Voltage : AC230/110V selectable2, Motor Type : DC motor , The aluminum base (motor base) is made up by plastic coating ... purposes21, Overheat and overload dual protection22, Self-lock electromechanical gear motor23, Time delay closed is adjustable24, Can be connected ... and button switch and loop detector25, Gear-drive or chain-drive is optional26, Gear case made of aluminum alloy27, ...