Big Cheese Ultra Power Electronic Mouse Killer. The Ultra Power Electronic Mouse Killer from The Big Cheese is an effective and humane way to catch and kill mice in indoor areas – like the professionals use. Ergonomic electrical plates sense when a mouse enters the trap, delivering a high-voltage charge that kills in seconds once the mouse is enclosed within the unit. The Electronic Mouse Killer is guaranteed to kill mice, or your money back. The semi-transparent lid makes it easy to identify a successful kill and the catch can be disposed of by simply opening the lid – no mess, no fuss and no need to touch the captured mouse. An internal micro-switch, together with built-in safety features makes this trap safe to use in areas around children and pets. Kills over 100 mice per set of batteries.