It delivers high voltage electronic shock to kill mice, when a mouse enters the device to reach the bait, it reaches a point where it touches both killing plates, completes an electrical circuit and kill it seconds. Specification: 1. 4*C battery or 6V AC/DC power 2. High voltage output:6KV to 9kv 3. Power on LED indication 4. Low battery indication, up to 50 kills on one set of batteries 5. Unique tunnel design engineered to prevent rat and mouse from escaping