uxcell MC-52 Magnetic Reed Switch Alarm with 2 Wires for Rolling Doors - Normally Closed (N.C.) Security Sensor (2-Pack) - Perfect for Home Security Systems, Garage Doors & Window Alarms

Installation Instructions The door and window magnet should be installed at the closed position of the door/window.The magnet part is installed on the movable door and window. The switch part is installed on the fixed door and window frame. The switch part and the magnet part should be aligned as much as possible.The door magnet should be away from the strong magnetic field interference source such as a transformer. Otherwise, the working characteristics of the door magnet will be changed and possible wrong actions. Installation Steps NOTE The Magnetic Door Switch must be installed according to the sensing distance;It can only provide a switch signal to the device, which cannot directly load the power, nor directly connect the lamp! About Normally Closed and Normally Open N.C. / N.O. Definition 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 ).Please check the right need carefully before purchasing it!

[Specification] - Current 0.5A ; Voltage 100V ; Power Rating 10W; Action Distance 25~40mm

[Dimension] - Cable Length 23cm/9.1"; Total Size 49mm x 20mm x 10mm / 1.93" x 0.79" x 0.39"(L*W*H)

[Material] - The magnetic switch alarm is with durable zinc alloy housing for better rust resistance

[Normally Closed] - 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 ).

[Applications] - The Rolling Door Contact is designed for use with window and door alarm systems, such as garage, industrial warehouse and shops, etc.