Quality Elevator Door Operator from China. http://www.elevator-component.com/china-700mm_center_opening_door_operator_device_for_passenger_lift_elevator_device-30195992.html PRODUCT FEATURES The interlock has passed 1 million life cycle test, CE certified; the landing door has passed 45kg pendulum impact test Using self-weight door-closing mode, the self-weight and guide rod are placed in the inner side of door panel, for glass panel, the weight drop is beside the door panel Delocking on door panel and door frame are available The interlock contact voltage: AC 110V, DC 220V Applicable for glass door panel SHANGHAI SUNNY ELEVATOR CO.,LTD quality manufacturer from China.