LE Sircut LEMS-101-5, 5PCS Recessed Magnetic Door Contact Sensors - Wired Normally Closed (NC) Security Alarm Reed Switch Kit for Home & Office - Professional, Hidden Installation for Doors & Windows

• ✅ PROFESSIONAL, HIDDEN SECURITY! Achieve a clean, discreet look with our completely recessed sensors. Unlike bulky surface-mounted contacts, these install flush into your door or window frame, becoming virtually invisible to guests and intruders alike.
• 🔧 UNIVERSAL COMPATIBILITY & RELIABILITY! Features a Normally Closed (NC) dry contact circuit, making it compatible with most wired alarm panels (DSC, Honeywell, Ademco, etc.). Built with a high-quality reed switch for millions of reliable operations.
• 🛠️ EASY RETROFIT INSTALLATION! Each sensor is pre-wired with 2-conductor cable for simple connection. The compact design makes it easy to install in standard door and window frames. Includes a helpful installation guide for confident DIYers.
• 📦 COMPLETE 5-PIECE VALUE KIT! Secure multiple entry points for the price of one. This kit includes (5) recessed sensors and (5) matching magnets, plus all necessary mounting screws. Perfect for securing your front door, back door, garage door, and windows.
• 🏠 PROTECT WHAT MATTERS MOST! Ideal for enhancing the security of your home, office, garage, or shed. Works on doors, windows, cabinets, or anywhere an opening needs to be monitored. Backed by our satisfaction guarantee. Add to Cart now!

These are used to secure an alarm circuit on a door or window. Sold as a pair, one has a magnet inside, the other a reed switch. They have powerful magnets, with self adhesive or screw mount, and screw terminal connections. Reed Switch contacts: closed when both units are together (ie current flows), and open when apart. Normally CLOSED (NC) per pair. Contact operation: Contacts are closed cicuit when the magnet is alongside the switch. For alarm installation this is denoted as the "normal" state as the door/window is secure and the alarm is armed. Contact operation: Contacts are closed cicuit when the magnet is alongside the switch. For alarm installation this is denoted as the "normal" state as the door/window is secure and the alarm is armed.