Big Cheese Ultra Power Neo-Zap Electronic Rat Killer. Ultra Power Neo Zap Electronic Rat Killer for the Big Cheese features patent pending technology that delivers fast and humane control of target pests - just like the professionals use. Each unit includes a starter-pack of high palatability Neo-Zap Rodent Lure, with refill readily available on-line and from local stockists. Set-up and operation of the battery powered unit is simple. A single battery set generates up to 50 lethal electrical charges and the unit is guaranteed to kill rats.