Advanced Features ¡î Gear-drive or chain-drive is optional ¡î Magnetic or spring limit switch is optional ¡î The self-locking oil immersed electromechanical gear motor keeps the gate completely closed ¡î Stop on closing if it hits obstruction ¡î Overheat & overload dual protection ¡î Emergency release key in case of power failure ¡î Output available to photocells, loop detector, IC card, alarm lamp and remote controller