Resideo 7939WG-BR MPS20 Surface Mount Magnetic Contact with Terminals, 1-1/4" Gap, SPST, Brown

Protect doors and windows with a dependable, easy-to-install magnetic contact designed for everyday security monitoring. The Resideo 7939WG-BR magnetic contact provides reliable closed-circuit detection using a SPST (Normally Closed) reed switch and a roomy 1-1/4" standard gap—ideal for varied mounting offsets on residential or light-commercial openings. Its surface-mount form factor ships with spacers, cover and screws so you can deploy sensors quickly, using screws or double-sided adhesive for hybrid installation. The cover conceals the end-of-line (EOL) resistor for neat wiring and improved tamper resistance, and the brown finish blends into wood doors and frames for discreet surveillance. Rated to operate to -40°F and built for wired security systems, this contact supports series wiring on a single zone and integrates easily with alarm panels for perimeter protection and monitoring. Choose the Resideo 7939WG-BR when you need a low-voltage sensor that balances reliability, simplicity and a clean aesthetic—order now to strengthen your security and surveillance setup.

• Reliable perimeter detection with a Normally Closed SPST reed switch for consistent security monitoring
• Surface-mount design with included spacers, cover and screws for fast, tool-friendly installation
• 1-1/4" standard gap gives flexible placement on doors and windows for residential and light-commercial sites
• Concealed end-of-line (EOL) resistor simplifies wiring and maintains a clean, tamper-resistant appearance
• Durable operation down to -40°F and a discreet brown finish that blends with wood frames and trim