Door Window Contact Sensor Magnetic Type, Mini Replacement for SF20R DB03, Compact Design

Contact Sensor for SF20R and DB03 Mini Magnetic Window and Door Sensor (1 Sensor Only) Key benefits Replacement and compatibility: Designed for direct compatibility with SF20R and DB03 alarm and monitoring units, so you can a single magnetic sensor without changing the system. Compact and discreet: Mini size fits narrow door and window frames where larger sensors do not, keeping installations tidy and unobtrusive. Simple open and close detection: Magnetic contact operation provides a clear indication when a door or window is opened or closed, helping you monitor entries and exits. Single sensor solution: Supplied as one magnetic sensor only, ideal for replacing a lost or damaged unit or expanding coverage one point at a time. What it does and why you need it This compact magnetic contact sensor provides reliable open and close detection for doors, windows, and other access points that pair with SF20R and DB03 systems. It restores monitoring capability quickly when a single sensor fails or when you need an extra sensor in a specific location. Key attributes Function: Magnetic contact sensor for open/close detection. Compatibility: Works with SF20R and DB03 models. Size: Miniature, lowprofile design for tight spaces. Package: One magnetic sensor only. Practical applications Front door monitoring: a damaged sensor to restore entry alerts on your SF20R or DB03 system. Window security: Install on sliding or narrow windows where space is limited. Interior access points: Use on cabinets, interior doors, or storage areas to add a single point of monitoring without replacing the whole sensor set. Installation and usage tips Position the magnet and sensor so they align when the door or window is closed for accurate detection. Use one sensor to an existing unit or to add targeted coverage where needed. This product is intended as a compatible magnetic sensor for SF20R and DB03 systems and is provided as one sensor only for focused replacement or expansion.