Nattaro Scout Bed Bug Monitors come in a pack of 12. 

The Nattaro Scout bed bug trap system consists of a bed bug trap with a replaceable pheromone lure. Traps and lures are sold separately in packs of 12, or in a kit containing 4 traps and 4 lures.  The lure is made of a proprietary blend of pheromones that mimic the scent of a bed bug harbourage. This scent attracts all life stages of bed bugs in a room.  Males, females, and all different nymph stages are attracted to the traps.  Bed bugs are able to crawl into these pitfall traps, but once inside they are unable to climb out.  Nattaro Scout traps are 100% non-toxic, so they can be placed directly in/on furniture such as beds or sofas, or elsewhere in a room where bed bugs tend to harbor.  For best results, it is recommended to place 2 traps/lures per bed, either on the floor by the bed legs at the head of the bed, or between the box spring and mattress in the corners at the head of the bed.  The lures last up to 4 weeks, so if additional monitoring is needed after that time, it will be necessary to replace the lures.