[Dimension] - Cable Length: 23cm/9.1"; Total Size: 48.5 x 24.6 x 15mm / 1.91 x 0.97 x 0.59 inch (L*W*H)
[Material] - The magnetic switch alarm is with durable zinc alloy housing for better rust resistance
[Normally Open] - 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.