This thing works great! I bought this for my husband because he hates even a mosquito in the house. We live in Texas and the mosquitoes are huge, vicious and numerous. Anyway, he wasn't happy when he saw it and said it was a scam, a waste of money. bla bla bla. But yesterday we had mosquitoes in our living room so I took it out and bit it and the look on husband's face was priceless! He's a believer now! Since then we have blocked several more. It's actually fun! I have always trusted the Black and Decker brand and this product is no exception! It's also a great gift for men who are hard to buy.