At first I wasn't sure if this unit would work. I had severe allergy related breathing problems and after turning the device on for the first time it was constantly green. I didn't really notice a difference until a week later. About a week later, my voice returned to normal. However, the device was still green, so I purposely burned my dinner one night to see if the device could detect it. It happened instantly, turning from green to bright red. Then after a while it turned blue and then green again. I highly recommend this block. With an air purifier, closed windows and just the air conditioning, I feel a lot better.
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