{"product_id":"magnetic-door-window-contact-sensor-reed-switch-security-alarm","title":"Magnetic Door Window Contact Sensor – Reed Switch Security Alarm","description":"\n\u003ch2\u003eMagnetic Door \u0026amp; Window Contact Sensor with High-Sensitivity Reed Switch\u003c\/h2\u003e\n\u003cp\u003eKeep your home, shop, office, or warehouse more secure with this high-sensitivity \u003cstrong\u003emagnetic door and window contact sensor\u003c\/strong\u003e. 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.\u003c\/p\u003e\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInstant Alert Technology:\u003c\/strong\u003e Magnetic induction detects unauthorized entry the moment a door or window opens, triggering your alarm system immediately for fast, effective protection.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUltra-High Sensitivity:\u003c\/strong\u003e The reed switch is precision-engineered to detect even the slightest movement, ensuring no subtle intrusion goes unnoticed.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTool-Free Installation:\u003c\/strong\u003e Simple, straightforward setup requires no professional tools — just follow the included instructions and you're up and running in minutes.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide System Compatibility:\u003c\/strong\u003e Works seamlessly with a broad range of home and commercial security systems, including connections to monitoring stations or security service centers.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVersatile Multi-Scene Use:\u003c\/strong\u003e Ideal for homes, apartments, shops, offices, garages, warehouses, and controlled access points — adaptable to virtually any entry point security need.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNormally Open \u0026amp; Normally Closed Modes:\u003c\/strong\u003e Supports both NO (Normally Open) and NC (Normally Closed) configurations for maximum flexibility with your existing alarm setup.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Discreet Design:\u003c\/strong\u003e Measures approximately 5.5 × 1.4 cm (2.17 × 0.55 in) — small enough to fit unobtrusively on door frames and window sills.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Plastic Housing:\u003c\/strong\u003e Lightweight yet sturdy plastic construction stands up to daily use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Plastic\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e Approx. 5.5 × 1.4 cm \/ 2.17 × 0.55 in (manual measurement; ±5 mm tolerance)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSwitch Type:\u003c\/strong\u003e Normally Open \/ Normally Closed Reed Switch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e As shown in pictures\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Contents:\u003c\/strong\u003e 1 Pair (sensor + magnet)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in Mainland China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhere to Use It\u003c\/h3\u003e\n\u003cp\u003eThis contact sensor is designed for maximum versatility. Mount it on:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFront doors, back doors, and side doors\u003c\/li\u003e\n  \u003cli\u003eGround-floor and basement windows\u003c\/li\u003e\n  \u003cli\u003eGarage doors and roll-up shutters\u003c\/li\u003e\n  \u003cli\u003eWarehouse access panels and storage room entrances\u003c\/li\u003e\n  \u003cli\u003eShop display cabinets and commercial entry doors\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/0-50-psi-dial-tire-pressure-gauge-car-motorcycle-bike\"\u003e0–50 PSI Dial Tire Pressure Gauge – Car, Motorcycle \u0026amp; Bike\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-4-inch-npt-nickel-plated-brass-air-compressor-tank-fill-valve\"\u003e1\/4\" NPT Nickel Plated Brass Air Compressor Tank Fill Valve\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/hex-shank-wire-twister-drill-attachment-rebar-tie-tool\"\u003e1\/4\" Hex Shank Wire Twister Drill Attachment | Rebar Tie Tool\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more information on home security best practices, visit the U.S. Consumer Product Safety Commission (CPSC) Home Safety Guide.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the difference between Normally Open (NO) and Normally Closed (NC) on this magnetic contact sensor?\u003c\/h4\u003e\n\u003cp\u003eA: In \u003cstrong\u003eNormally Open (NO)\u003c\/strong\u003e 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 \u003cstrong\u003eNormally Closed (NC)\u003c\/strong\u003e 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.\u003c\/p\u003e\n\u003ch4\u003eQ: Do I need professional tools or wiring experience to install this door window contact sensor?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this magnetic reed switch sensor compatible with my existing home security system?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003ch4\u003eQ: Can this sensor be used on both doors and windows?\u003c\/h4\u003e\n\u003cp\u003eA: Yes — this \u003cstrong\u003emagnetic contact sensor\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the difference between Normally Open (NO) and Normally Closed (NC) on this magnetic contact sensor?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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. 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