Bed Bug ALERT helps you create a long-term, low-cost bed bug monitoring program, so problems can be detected before an infestation occurs. The effective, proprietary attractant gel lures and traps bed bugs. Small, transparent monitor slips discreetly under mattresses, and features a clear viewing window, making inspection simple. Patented housing is tamper-proof, and sturdy construction prevents the monitor from being crushed while in use. Attracts both adult bedbugs and 2nd instar nymphs. 1 to 4 monitors per bed/furniture piece recommended. Lasts up to 6 months. 144 pack.