Product summary A recessed contact sensor for door and window monitoring that provides immediate intrusion detection and reliable longterm performance. Designed for easy installation on wood and metal frames and compatible with most alarm systems using a normally closed circuit. Key benefits Immediate and precise detection: Sensitive switch and strong attachment contact detect intrusions quickly to alert your security system when a door or window is opened. Works with existing systems: Normally closed circuit and simple twowire installation integrate with most alarm panels and controllers without extra configuration. Durable and dependable: Tamperresistant ABS casing and a design rated for thousands of cycles deliver consistent operation and fewer false alarms. Flexible installation options: Recessed mount for wood doors and a surface mount for metal frames are included, along with a full mounting kit and generous wire length for versatile positioning. Wide voltage compatibility: Compatible with 12v24v dc systems for straightforward power integration. Features Function: Door and window contact sensor for intrusion monitoring. Mounting: Recessed mount for wood doors; surface mount for metal frames; complete mounting kit included. Wiring: Simple twowire connection; normally closed circuit compatible with most systems; extra wire length provided for flexible placement. Construction: Tamperresistant ABS casing for protected operation and long life. Performance: Sensitive switch tuned for accurate triggering and reduced false alarms; designed to perform reliably through thousands of cycles. Compatibility: Works seamlessly with most alarm control panels that accept normally closed contacts and 12v24v dc power. Typical applications Residential front and back doors: Recess the sensor into wooden doors or use the metalframe mount for secure monitoring of entry points. Commercial storefronts and office suites: Install on glass doors, metal frames, or interior office doors to integrate with an existing alarm system. Warehouses and service entrances: Monitor metal security doors and gates using the surface mount and extended wiring for flexible placement. Why customers choose this sensor Provides accurate, immediate detection for critical entry points without complex wiring or system changes. Adapts to different door and frame types with supplied mounting options and extra wire length for placement. Offers a durable housing and reliable switching mechanism to reduce maintenance and false alarms over time. What is included Contact sensor with tamperresistant ABS casing Recessed mount for wood doors Surface mount for metal frames Full mounting kit and extra wire length Instructions for twowire normally closed installation and integration with 12v24v dc systems Compatibility note Designed to work with most alarm control panels and monitoring systems that accept normally closed contacts and 12v24v dc power.