The W·H·Y Trap has two chambers and three attractants to catch 19 different species of insects. The top chamber is baited with two attractants -- one of which is a solid contained in a vial, and the other a liquid mixed with water. The bottom chamber is baited with a liquid attractant poured onto a cotton pad. Wasps, hornets and yellowjackets have two ways to enter: either through the top cap, or through the holes in the bottom cap.