First response trap designed to identify and monitor potential bed bug infestations. 4 traps included in box. Attracts Bed Bugs & Kills Clear window to inspect daily if Bed Bugs are present Designed to withstand the weight of mattress Place Under 4 Corners Of The Bed Place between your box spring and mattress at all 4 corners, in between couch cushions, or wherever bed bugs are suspected, and check for bugs Soft Felt Surface to allow bedbugs to easily crawl into trap. Ridged design to prevent collapse of trap while between mattresses