Magnetic switch limit Aluminum alloy gear box Thermal protection at 125℃ built in motor winding In case of power failure, the gate can be opened an dclosed manually after release clutch Protection class IP44 Operating environment temperature -20℃~+50℃ Gear-drive or chain-drive is optional Self-locked electromechanical gear motor Safety obstruction reverse (infrared photocells must be installed) Overheat and overload dual protection Emergency release key in case of power failure Output available to photocells, loop detector, IC card, alarm lamp and remote control