The Protecta RTU is small, triangular shaped, and holds 15g Contrac Blox baits. With angled entry holes, it fits flush against a wall or in a corner where mice travel. The interior baffles lead mice to the bait. Compact PROTECTA RTU measures 5 1/4″ (l) x 1 1/4″ (h) x 3 3/4″ (w). It fits in tight baiting places under pallets, in cupboards or behind appliances. This tamper-resistant bait station automatically locks when closed, keeping bait away from intruders. It unlocks with the Protecta 2-prong key.