The Hagen Vision Breeding Box works both inside and outside of all models Vision Bird Cages. It provides a safe shelter for mating birds, nesting pairs and tending to baby Parakeets, Lovebirds and Parrotlets. A protective door allows for viewing babies' progress without disturbance to occupants. This breeding box is quick and easy to install by simply hooking onto the cage bars. Comes complete with two plastic liners, one perch and one side viewing cap. Measures 9" x 5 3/4" x 7".