Mate they are bullshit anyway. I bought one and it drove the old gal mad, no matter what she did it was so inaccurate it made f-all difference unless you were in the shower or if you have an electric cooker.

We are talking common sense here, switch shit off when not in use! These owl things make you go anal and the cost of the machine probably outweighs its usefulness (I paid £30 quid and returned it a week later!)

Mega inaccurate as well.