Bed Bug Alert is formulated as a way to check and verify if bed bugs are present; the clear, safe and rigid plastic monitoring device simply slips between mattresses and frames. Features a special gel attracting and trapping bed bugs alerting you if they are detected. Recommended for use when traveling in hotels, luggage and briefcases. Lasts for approximately 3 weeks but may be less in dry climates. Available in a convenient 2 pack.