Made with the highest quality cedar, which weathers well and retains heat. The Organization for Bat Conservation house is fully caulked and offers a longer design which is a key factor in occupancy. Thinner chambers give protection from predators, the inside is covered with a polyethylene mesh to aid in maneuverability and there is an extra long landing platform. Proper bat house design is a very important factor in occupancy. Our bat houses have a greater than 80% occupancy rate, as compared to only 10% with some other designs.Triple-celled bat houses tend to work quicker and for longer periods (i.e. throughout spring, summer, and fall). These houses are especially good for larger backyards (more than one acre) or agricultural areas. Holds up to 300 bats. Dimensions: 24 in. tall, 14 in. wide, 6 in. deep. Comes with mounting instructions.