Jolly pleased with this. Bought it from a local store at £30, did not know this was on Amazon at a cheaper price. Fed up with a neighbour's pet cats using my front garden to poo vast amounts. Cost me a fortune in short term remedies and repeated trips to the tip with large amounts of minging contaminated top soil. Also, my 26 month old grandson has walked by the mega sonic repeller with it switched on and shown no sign of awareness or distress (perhaps those claiming health hazards for their children should try buying a litter tray for their cats - might teach their kids citizenship as well as saving their neighbours money). There is, however, a distinct and welcome lack of cats on my garden, hurray.