Magnetic Door Window Contact Sensor – Reed Switch Security Alarm

Magnetic Door & Window Contact Sensor with High-Sensitivity Reed Switch

Keep your home, shop, office, or warehouse more secure with this high-sensitivity magnetic door and window contact sensor. Using reliable magnetic induction technology, this reed switch sensor instantly triggers your connected alarm system the moment a door or window is opened without authorization — giving you real-time awareness and peace of mind.

Made in Mainland China.

Key Features

• Instant Alert Technology: Magnetic induction detects unauthorized entry the moment a door or window opens, triggering your alarm system immediately for fast, effective protection.
• Ultra-High Sensitivity: The reed switch is precision-engineered to detect even the slightest movement, ensuring no subtle intrusion goes unnoticed.
• Tool-Free Installation: Simple, straightforward setup requires no professional tools — just follow the included instructions and you're up and running in minutes.
• Wide System Compatibility: Works seamlessly with a broad range of home and commercial security systems, including connections to monitoring stations or security service centers.
• Versatile Multi-Scene Use: Ideal for homes, apartments, shops, offices, garages, warehouses, and controlled access points — adaptable to virtually any entry point security need.
• Normally Open & Normally Closed Modes: Supports both NO (Normally Open) and NC (Normally Closed) configurations for maximum flexibility with your existing alarm setup.
• Compact & Discreet Design: Measures approximately 5.5 × 1.4 cm (2.17 × 0.55 in) — small enough to fit unobtrusively on door frames and window sills.
• Durable Plastic Housing: Lightweight yet sturdy plastic construction stands up to daily use.

Specifications

• Material: Plastic
• Size: Approx. 5.5 × 1.4 cm / 2.17 × 0.55 in (manual measurement; ±5 mm tolerance)
• Switch Type: Normally Open / Normally Closed Reed Switch
• Color: As shown in pictures
• Package Contents: 1 Pair (sensor + magnet)
• Origin: Made in Mainland China

Where to Use It

This contact sensor is designed for maximum versatility. Mount it on:

• Front doors, back doors, and side doors
• Ground-floor and basement windows
• Garage doors and roll-up shutters
• Warehouse access panels and storage room entrances
• Shop display cabinets and commercial entry doors

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For more information on home security best practices, visit the U.S. Consumer Product Safety Commission (CPSC) Home Safety Guide.

Frequently Asked Questions

Q: What is the difference between Normally Open (NO) and Normally Closed (NC) on this magnetic contact sensor?

A: In Normally Open (NO) mode, the circuit remains open (no current) when the magnet is close to the sensor, and closes (current flows, alarm triggers) when the magnet moves away — ideal for most door/window alarm setups. In Normally Closed (NC) mode, the circuit is closed when the magnet is near, and opens when separated. Your choice depends on how your security alarm panel is wired. This sensor supports both modes, giving you full flexibility.

Q: Do I need professional tools or wiring experience to install this door window contact sensor?

A: No professional tools are required. The sensor is designed for easy DIY installation — simply attach the magnet portion to the moving part of the door or window and mount the reed switch sensor on the fixed frame, then wire the leads to your alarm panel according to the instructions. Most users can complete installation in just a few minutes.

Q: Is this magnetic reed switch sensor compatible with my existing home security system?

A: This sensor is designed for broad compatibility with a wide range of wired home security systems, alarm panels, and monitoring stations that accept standard NO/NC contact inputs. We recommend checking your alarm panel's specifications to confirm it accepts wired door/window contact sensors before purchasing.

Q: Can this sensor be used on both doors and windows?

A: Yes — this magnetic contact sensor is suitable for interior and exterior doors, windows of all types, garage doors, cabinet doors, warehouse panels, and any other hinged or sliding entry point where magnetic separation can be detected.