Our BCI Certified Triple-Chamber nursery Bat Boxes are built on a high standard and engineered for success. The bat houses can be installed outdoors on trees, poles, buildings, etc. All the hardware and attachments are included to make it easy to install. Its size is one of the biggest on the market 26.5" x 16" x 6" which makes it more efficient to protect much more bats than any other bat house. These bat boxes are hand-carved from Western Red Cedar and naturally resistant to water, making them ideal for all-weather. The three chambers offer optimal roosting space that is enticing to female bats looking to start a colony. It can hold up to 200 bats, effectively clearing the backyard of many pesky insects. BCI certified bat houses have a 98% greater occupancy than non-certified models.