The Elevator Door Control Light Screen Model PSC-4 by Tri-Tronics (New open box) is a durable and easy-to-install door control unit with a screw-in, snap-on mounting style. It features a fast microprocessor, corrosion protection, and includes mounting hardware, software, and instructions for programming. Made from high-quality materials such as nylon grade material, hi-flex robotic parts, and rugged metal, this unit is designed for long-lasting performance. With a weight of 4 lbs, this NEMA 1 enclosure unit is perfect for controlling elevator doors efficiently and reliably. NOTE: Any questions regarding this elevator door control ? light screen model PSC-4 device by Tri-Tronics. Send a message on the messaging system and allow up to 48 hrs (most common to uncommon questions) to (72 hrs or more for more detailed involved questions), thank you very much! DELIVERY OPTIONS ? USPS GROUND ADVANTAGE ? ?MEETUP AT SAFE AREA/ZONE ??? INTERNATIONAL SHIPPING