[Dimension] - Cable Length: 48.5cm/19.1"; Total Size: 106 x 37.3 x 9.7mm, 106 x 15 x 15mm (L*W*H)
[Material] - The magnetic switch alarm is with durable zinc alloy housing for better rust resistance
[N.O./N.C.] - N.C. means Normally Closed: When the magnet together, the circuit is conductive( light on ); when the magnet separates, the circuit is not conductive ( light off ). N.O. means Normally Open: when the magnet separates, the circuit is conductive( light on ); When the magnet together, the circuit is not conductive ( light off ). When make order, pls check carefully!
[Applications] - The Rolling Door Contact is designed for use with window and door alarm systems, such as garage, industrial warehouse and shops, etc.