Electric Fly Killers

Black & Decker Ultrasonic Pest Repeller have a 100% Duty Cycle which means the unit is continually emitting ultrasonic "noise". The frequency ranges from 26-74Khz at 105 decibels in a constant fluctuation so to continually disrupt the pests and force them from your home. Pests are repelled because they cannot adapt to the constantly changing array of complex ultrasonic and sonic sounds.

Amazon Sales Rank: #23134 in Lawn & Patio Color: white Brand: Black & Decker Model: EX900-A-TP1 Dimensions: 7.50" h x 2.60" w x 9.50" l, X-Large room coverage Variable settings battery operation option on off switch

Most helpful customer reviews 31 of 31 people found the following review helpful. Honest Opinion: they seem to work for mice By Amy J. Shaw My story is this: Got some mice in the house at the start of the winter. Little poops all over, chewed cereal bars in the closet/cupboard, mice in the trash can etc. Laid out traps and caught four of them but still had: little poops all over, chewed cereal bars in the closet/cupboard, mice in the trash can etc. So I brought two of these units. At first I put them both in the basement where I had actually seen the little critters (I have a pretty big house) and I didn't see any evidence of them in the basement after two days or so but upstairs it was still: little poops all over, chewed cereal bars in the closet/cupboard, mice in the trash can etc. So I moved the "pest repellers" upstairs and put all my food items in plastic containers. I saw some evidence of a mouse in the trash the first morning but since then, nothing. I don't know if it was me storing the food better, the pest repellers or both but I have seen nothing. I have been moving these things around the house every other day or so and they seem to work for me. I would give the unit five stars but they do have one draw back, they do make noise. If you expect these things to be quiet your in trouble, they chirp. It's not too loud and doesn't bother our dog or us but it does make noise. For me the chirping is a small price to pay to get rid of the mice. 19 of 20 people found the following review helpful. Makes annoying chirping noise By Mark The repeller works fine at repelling, but when on the "rodent" setting it makes an audible chirping noise that's annoying so it can be used only in remote locations where people don't normally go.The reason we bought this model was because it can run on batteries and we wanted it for an outer shed, but the manual says that it'll only run two or three days on battery power, making it absolutely worthless for this use. 11 of 11 people found the following review helpful. Spider be Gone By Robert W. Stowe Purchased and installed (plugged it in) on our outside covered porch which was infested with several species of house spiders (crab, wolf, small web floaters, etc.).I had cleaned up all egg casings that I could find and vacuumed all visible webs the first of September. Since plugging this little devil in two weeks ago, I have not seen any new webs or crawling spiders within an eight foot range of its location against the inside wall. Garden spiders still crawl across the farthest outside screen, but our problem with dozens of webs against the inside wall near the sliding doors has been eliminated. Instructions state that some species will adapt to the ultrasonic range and may take up new residence. So far, that has not happened. I am very pleased with this piece of technology. See all 28 customer reviews...