FIS Mouse Trips® are designed to be mounted to the fence line. When tripped, an internal plunger creates a loss of light which is recognized by the control unit and activates alarm mode. They have been designed for dependable performance during the extended deployment in harsh weather environments. It is water resistant, dust proof, UV protected and able to stand up to the extremes in temperature fluctuations. The Mouse Trip® requires minimal maintenance throughout its service life. Once installed, the Mouse Trip® will provide years of reliable protection.