Actually nothing at all in this beetle trap.
Take a piece of plastic cardboard, glue a half dozen plastic straws to it, place it on the top bars of your hive. When you open your hive, take the unit and knock the beetles out of the straws into a bucket of soapy water.
This idea was brought up at our latest Empire State Honey Producers Assn. meeting by a guy from PA, Mark Antunes. I think he is a PA Apiary Inspector.
I'm going to try it on some colonies in SC and see what I get. Just thought y'all might like to hear of it. It's a management tool, not a treatment.