State-of-the-art 'smart' electronics control this unique device. When a rat enters the electronic rat killer to reach the bait, it reaches a point where it touches both killing plates and completes an electrical circuit, which kills it in seconds. Because of the open design to suit rats rather than mice, the rat killer is intended for use by professional pest controllers and agricultural workers. Four C-size batteries (not included) provide enough power for up to 12 kills. Warning light signals when batteries need replacing. Also kills mice. A warning light signals when the device has been activated so that the remains can be removed and the trap reset. Full instructions for use provided. Also effective against mice.