The design of these traps enable them to be used inside our bait boxes for that added safety around Pets and children. The design of our traps also allow for easy cleaning as being made with durable plastic are less likely to become stained and ideal for prolonged use. Opkill rat traps are very easy to use. These traps can be used inside the household or externally. Our trap has an integrated bait cup feature that allows you to easily place your bait to lure the rats and mice in. With this feature it prevents the rodents from stealing the bait without the likelihood of not getting caught!. These traps are simple and safe to set: simply squeeze the rear locking bar of the trap down to self setting clip hook until the trap Locks in place, then place the trap indoors or outdoors where you noticed rodent activity.