From the Manufacturer:
"The Clear-View Nature House has a very special catch, observe and release design. The wooden box has a large, clear sliding door which makes it easy for your child to place insects and other critters inside, then let them go unharmed after observing. One side has a cricket proof metal screening for full ventilation while the impact resistant door provides clear, unobstructed viewing. The door has a stopper to prevent loss. This lightweight Nature House measures 4.5" L x 3.38" W x 4.5" H and has a convenient carry strap. Made in the USA."