If the directions for use are followed, this works very well - in a dark room, where there's little activity. Especially in combination with Advantix (or another, just not Hartz - that stuff is dangerous) flea and tick drops for the pet. My son and I made it a math game (he loves math) for him to keep track of how many fleas were found each morning, added to the previous flea count. Even during daytime and evening with the lights on, if there's no one in the room so the fleas don't jump on you instead, fleas would jump in. Not in hordes, thank goodness, but it did help to clear the fleas from the floor and furniture without having to use stinky powders or chemicals. I would recommend this!!