Resideo 4939SN-WH V-Plex Surface Mount Contact with Cover, White

Protect entry points with dependable, easy-to-install monitoring using the Resideo 4939SN-WH V‑Plex surface mount magnetic contact. Designed for commercial security and surveillance installations, this programmable magnetic contact provides reliable door/window status reporting over a wired V‑Plex polling loop, helping reduce false alarms and streamline addressable device management. The 4939SN-WH accepts VISTA keypad programming or learn mode and is compatible with control panels that support serial-numbered multiplex polling. Its Form A (SPST) reed switch is powered directly by the panel (12 VDC, 1 mA), eliminating the need for separate power wiring. With a standard 1-1/4" (32 mm) gap, 5' cable and a discreet white surface-mount housing with cover, it fits most frames and mounting configurations while maintaining a professional look. Backed by a 2-year limited warranty, the Resideo 4939SN-WH is ideal for security integrators, facility managers and monitoring stations that demand consistent performance and easy deployment. Add this magnetic contact to your next access control or monitoring project to improve perimeter protection — order now or contact sales for bulk pricing.

• Reliable door and window monitoring with programmable V‑Plex addressing to reduce false alarms and simplify device management
• Surface-mount design and included cover for fast commercial installation and a clean, low-profile white finish
• Supports a standard 1-1/4" (32 mm) gap and a 5' cable for flexible placement on frames and doors
• Form A (SPST) reed switch powered by the V‑Plex polling loop for low-power, wired security integration
• Easy programming from a VISTA keypad or learn mode, compatible with control panels that support serial-numbered multiplex polling