I cannot say that the result is great. After a cat finished his job this device thinks for a minute and starts to work afterwards. And I can feel smell of ozone. But at the same time litter also works with a bit of delay. So I cannot say exactly who works more - the device or the fact that poops already buried into the litter. Also one disadvantage. The LED is very bright and I cannot just shade it with a sticky tape. Because it is joined with the sensor.