A system and method of detecting and signaling the activation of a spring-loaded rat trap located at a remote location. The system includes a wireless transmitter mounted inside a transmitter unit upon which a spring loaded rat trap is placed. When a rat is caught by the trap, the rat drags the trap over the top surface of the transmitter unit causing activation of one or more switches located on the top surface. The switch is coupled to the wireless transmitter that sends a signal to a wireless receiving unit located in the vicinity. Coupled to the receiving unit is a light or sound alarm that is activated when a signal is received from the transmitter unit indicating that the trap has been moved over the transmitter unit. The system may be used with one or more transmitter units so that system may be used to monitor rat infestation one or multiple locations.