The box or description did not say for how many sq ft it will cover, so we thought one each floor is enough. However, when I take a detail look inside the package, it says cover 400sq ft. So I need to order one for each floor to opposite side. But even I have one on one floor which is over 500 sqft, at the beginning cannot notice anything, after 2 weeks, start seeing the first bug (spider), then the next day find few bugs, and after that no seeing it so far. I think it starts working well. So i order 2 more for each floor to have max coverage. It is very quiet and nice looking gadget to have. The nightlight is nice. The green lights will blink few minutes then off and the red light is on all the time. I wish both lights colors are switched as I would prefer to see the green lights on all the time instead of the red. Besides that I think for $20 bucks to give it a try it wont hurt your pocket if you hate bugs.
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