These stink like rotten socks!
I couldn’t tell you if they work as I’m loathed to keep them switched on at the plug as they stink. After plugging 2 of these in around my house I smelt what I could only describe as dirty socks in my living room. It took me an hour or 2 to realise what it was and as soon as I switched the socket off the smell went. I tried again with the plug in my hall and within hours that smell came again. It’s really not nice. I have 5 cats and 2 of them really don’t get on, but I can’t use these!