We are a product development company with a broad range of product designs. We manufacture, chain actuators, roof vent motors, skylight motors, motorized awning windows, motorized transom windows, motorized clerestory windows, motorized hopper windows, motorized cupola windows, fire ventilation, greenhouse ventilation, automation control, lighting control systems, home control & automation systems, Electronic stud finders that actually work, storm / screen door closers & motorized roof vent openers for skylights, roof vents, transom windows, clerestory windows and factory & warehouse ventilation windows & vents.Contact Number: 516-353-3333 (USA)Web Site: www.nstproducts.com