Big Cheese Ultra power Mouse Traps are easy to set, baited and ready to use. Simply remove the red bait well cover before setting. One simple click sets the trap and it becomes ready for positioning. For best results, place the two traps 2-3m apart where mice are active. It is recommended that gloves are worn when handling the traps to minimise the transference of human scents onto them. Heavy infestations may require more traps.