Product overview This pack contains 2 sets of magnetic reed switches designed for door and window security. Each set provides a magnet and a reed contact that can be wired as normally open or normally closed. The switches offer a simple, reliable way to detect opening and closing and integrate with wired alarm systems and controllers. Key benefits Reliable contact sensing: Reed switch technology provides consistent contact change when the magnet is brought near or moved away, giving dependable open and closed state detection. Flexible wiring options: Supports normally open and normally closed wiring to match different alarm panels and control inputs. Simple installation: Compact sensors mount unobtrusively on doors, windows, cabinets, or gates and connect with standard lowvoltage wiring. Broad compatibility: Designed to work with most wired alarm systems, security panels, home automation controllers, and DIY electronics projects that accept reed switch inputs. Low profile and unobtrusive: Small form factor keeps the sensor discreet while maintaining effective operation. Product attributes Contents: 2 sets of magnetic reed switch contacts, each set including a sensor and matching magnet. Function: Magnetic reed switch with selectable normally open and normally closed wiring behavior for security and sensing applications. Compatibility: Suitable for common wired alarm systems, security panels, and controller inputs used in home and commercial security setups. Mounting: Surfacemount design for doors and windows. Can be installed with screws or adhesive depending on mounting conditions. Performance: Designed for reliable switch action in typical door and window security scenarios. Intended for lowvoltage, lowcurrent sensing circuits. Practical applications Home entry monitoring: Install on doors and groundfloor windows to report openings to a security panel or alarm system. Cabinet and equipment protection: Use on cabinets, server racks, or storage boxes to detect unauthorized access and trigger alerts or logs. DIY and automation projects: Integrate with microcontrollers, alarm controllers, or smart home hubs to trigger scenes, notifications, or logging when a door or window is opened. Installation tips Position the magnet and sensor so they align when the door or window is closed and separate when opened. Choose normally closed wiring where you want the circuit to break on intrusion, or normally open wiring where the circuit closes on intrusion, depending on your system requirements. Verify voltage and input requirements of your alarm panel or controller before connecting. Test the contact operation after mounting to confirm reliable activation and deactivation. What this product solves Provides a straightforward method to detect open and closed states on doors, windows, and enclosures. Offers flexibility to match different alarm system input types via NO and NC wiring. Keeps installations discreet while delivering dependable sensing for security and automation needs. This product is a practical option for anyone needing a wired magnetic contact solution for basic security sensing and integration with existing control systems.