Maintain clear awareness of perimeter activity with a sensor designed for one of the most common security tasks: monitoring doors and windows. The 2GIG-DW100-345 wireless contact sensor reports when an opening changes state, giving alarm and access control systems the input they need to detect unauthorized entry attempts. Its wireless 345 MHz design simplifies installation in locations where wiring is impractical or costly. That makes it a strong fit for retrofit projects, tenant improvements, and distributed openings across offices, retail spaces, and light commercial environments. The compact contact format keeps the device unobtrusive while still supporting dependable perimeter coverage. For teams comparing contact sensors, this model stands out by pairing a proven wireless frequency with a straightforward door/window use case. It is a practical choice when the priority is reliable detection at the edge of the building, not unnecessary complexity.