N.C. Recessed Wired Security Window Door Contact Sensor Magnetic Reed Switch White RC33 10pcs Key benefits Discreet protection: recessed design keeps the sensor hidden inside the frame for a clean look and reduced tampering. Reliable detection: N.C. normally closed magnetic reed switching provides a clear open or closed signal for wired alarm panels. Ready for multiple zones: pack of 10 sensors lets you secure several doors and windows or keep spares for quick replacements. Easy aesthetic match: white finish blends with most door and window frames for minimal visual impact. What this product does Recessed wired contact sensor for door and window monitoring using a magnetic reed switch. Designed for normally closed operation so alarm panels detect a circuit opening when a door or window is opened. Important attributes Model: RC33 Operation: N.C. normally closed magnetic reed switch Mounting: recessed installation for a lowprofile, concealed fit Finish: white Compatibility and performance Works with most wired alarm control panels and security systems that accept normally closed magnetic contact sensors. Magnetic reed technology provides a simple, dependable electrical contact that responds when the magnet and switch separate. Suitable for interior and sheltered exterior installations where a recessed contact is appropriate. Practical installation notes Designed for recessed mounting within the frame and jamb so the switch and magnet align closely when closed. Connect to the NC zone or input of your wired alarm system following its wiring guidance; test the circuit before finalizing installation. Use common installation methods for recessed contacts such as drilling or mortising small cavities to house the switch and magnet. Use scenarios Home entry points: install in door frames to detect forced or unexpected entry and integrate with an existing wired alarm panel. Window security: conceal sensors in sliding or casement window frames to preserve appearance while monitoring openings. Office and retail: protect interior cabinets, storage doors, or secondary entryways where discreet, wired monitoring is required. Package contents Ten RC33 N.C. recessed wired magnetic reed contact sensors in white. Why choose this sensor Combines a recessed, lowprofile design with standard normally closed wiring for straightforward integration into wired security systems. A ten piece pack helps outfit multiple openings or serves as a stocked supply for routine maintenance and expansion. Note Ensure compatibility with your alarm panel and confirm installation clearances before cutting frames or jambs.