The AFS-101B Hardwired Fence Sensor is a fully encapsulated magnetic contact (Form C) S.P.D.T. with enough durability, gap, and vibration resistance, designed for outdoor perimeter protection. The biased technology incorporated onto the design provides a high degree of additional defeat resistance. This is due to the balanced condition that exists within. The fence sensor creates an alarm condition when tension is added by pulling on the wire, or by simply cutting the wire.