The Big Cheese Ready-Baited Live Multi-Catch Mouse Trap comes fully assembled and ready to use. The unit is suitable for both indoor and outdoor environments. Trap offers a safe and effective way to control mice without risk to children, pets, and non-target species of wildlife and birds. The dual setting mechanisms allow you to closely monitor rodent activity and act early when new infestations arise. This durable long-lasting trap works well indoors and out. Refill with 115458.