The thing I've never understood (& the guy in the shop nearby that sells them was useless about explaining it too), is, how are they supposed to neutralise the effects of electricity or whatever, when they are also electric? I know you can get tea light ones but DH isn't comfortable with naked flame in the house.
hehehe I thought the same thing, and partly it is true, which is why i started with the candles. But the electric ones the salt rock does warm up which is when it starts working. THere are USB ones for the computer too. If nothing else the ambiance is really nice!!!