Songbird Essentials Five Chamber OBC Bat House Designed by the Organization for Bat Conservation. Made of weather-resistant cedar and 3/4 inch exterior plywood back. Interior nylon mesh for maneuverability. Extended landing for easy entrance. Ventilation slot for air circulation. Holds 600 bats. Inspired from over 10 years of research, the Organization for Bat Conservation has designed the Songbird Essentials Five Chamber OBC Bat House. The OBC Organization for Bat Conservation has created a weather resistant cedar bat house that can hold up to 600 bats to make sure that a lot of bats have a safe home. The Songbird Essentials Five Chamber OBC Bat House has many features to make it a great place for bats to call home. It has extending landing for easy entrance and interior nylon mesh for maneuverability. By providing a protected home for these bats, they will return the favor by helping to control mosquitoes and other flying insects in your yard. Made in the USA. In Use Dimensions 21.00L x 7.00W x 24.00H.