I purchased this unit to handle a big ant and spider problem I get every summer in and around my garage. I kept it in place for 2 weeks and saw ABSOLUTELY NO REDUCTION in the number of creepy crawlies. Frustrated--and pretty disappointed that the marketing hype ...with no independent verification of effectiveness--I went to [local home store] and bought a half gallon of broad spectrum insect killer in a spray bottle... After a SINGLE application, my problem was gone. My advice to anyone considering this snake oil gadget is to save yourself some time, money and hassles and just skip straight to the proven chemical products.