Smart Magnetic Door & Window Contact Sensor NO NC Alarm

Keep your home, office, garage, or warehouse more secure with the Smart Magnetic Door & Window Contact Sensor. This compact, easy-to-install sensor detects when doors or windows are opened and instantly triggers an alert — giving you real-time awareness of entry points around your property.

Crafted from durable plastic and measuring just 5.5 × 1.4 cm (approx. 2.17 × 0.55 in), this sensor is discreet enough to fit seamlessly on any door frame or window sill without taking up space or ruining your décor. Its NO (Normally Open) and NC (Normally Closed) dual-mode design makes it compatible with a wide variety of alarm systems and control panels.

Key Features

• Dual NO/NC Output: Flexible normally-open and normally-closed contact modes for broad compatibility with alarm and access control systems.
• High Sensitivity Detection: Reacts quickly when the magnetic contact is broken, delivering near-instant alerts.
• Compact & Discreet: Slim profile (5.5 × 1.4 cm) blends into any door or window frame without drawing attention.
• Wide Application: Ideal for homes, offices, shops, garages, warehouses, and access-controlled entrances.
• Durable Plastic Housing: Lightweight yet sturdy construction built for everyday reliability.
• Easy Installation: Straightforward mounting — no complex wiring or specialist tools required.
• Great Value: Professional-grade security functionality at an accessible price point.

Specifications

• Material: Plastic
• Dimensions: Approx. 5.5 × 1.4 cm / 2.17 × 0.55 in
• Contact Type: NO (Normally Open) & NC (Normally Closed)
• Application: Doors, windows, cabinets, gates

Who Is It For?

Whether you're a homeowner looking to add an extra layer of awareness, a shop owner monitoring store entrances, or a facilities manager overseeing garage and warehouse access, this magnetic contact sensor delivers dependable, straightforward monitoring where you need it most. It also makes a thoughtful, practical gift for anyone interested in smart home security upgrades.

For more guidance on home security best practices, visit the U.S. Consumer Product Safety Commission (CPSC) for consumer safety tips and product standards.

Frequently Asked Questions

Q: What does the Smart Magnetic Door & Window Contact Sensor do?

A: This magnetic contact sensor monitors doors, windows, cabinets, and gates. When the two sensor halves are separated — meaning the door or window has been opened — the circuit state changes (NO or NC), triggering your connected alarm or alert system. It provides real-time awareness for homes, offices, shops, garages, and warehouses.

Q: What is the difference between NO (Normally Open) and NC (Normally Closed) modes?

A: In Normally Open (NO) mode, the circuit remains open when the magnet is in contact and closes (completing the circuit/triggering an alert) when separated. In Normally Closed (NC) mode, the circuit is closed when the magnet is in contact and opens when separated. This dual-mode design ensures compatibility with most standard alarm control panels and security systems.

Q: What is the sensor made of and how big is it?

A: The sensor is constructed from durable plastic and measures approximately 5.5 × 1.4 cm (2.17 × 0.55 in), making it compact and easy to mount on virtually any door frame or window sill.

Q: Is this sensor easy to install?

A: Yes. Installation is straightforward — simply mount one half of the sensor on the door or window frame and the other on the moving part (door/window sash). Connect the wires to your alarm or access control system according to your panel's NO or NC input requirements. No specialist tools are needed.