Bats can eat 3000 to 7000 insect nightly! Made right here in Maine, the mini bat house is solidly constructed for warmth, insulation and durability. What makes it unique from other bat houses, is the roughened interior surface which bats can easily cling to . The bottom is open so there is no need for cleaning and the birds will not nest in them. Made of pine it measure 15-1/2" h x 7-1/4" w x 3-3/4" d. enough to house a few bats. Hanger is included along with information about bats.