The Pest Repeller did not repel much actually it attracted more electricty then it repelled roaches. I purchased model EW406-5P also known as BLACK & DECKER E.P.R. kit for total home coverage with extra outlet and built in night light. After purchasing this item at about five dollars per unit, i was excited to plug them into my apartment. The unit is discreet, at first glance appears to be an air freshener. I placed the units in rooms like the kitchen and bathroom as directed. The unit states that its supposed to drive the roaches, mice, spiders and other pests away with ultra sonic waves. It...