Big Cheese Ultra Power Mouse Trap. Ultra Power Traps from The Big Cheese are performance tested to ensure effective control of mice � just like the traps that professionals use. Ultra Power Traps are also easy to set and supplied baited ready-to-use. Simply remove the bait cover and squeeze the trap to set � the traps are guaranteed to kill mice, or your money back. For best results place the two traps 2-3 metres apart where mice are active. Heavy infestations may require more traps.