Seems pretty accurate overall (I've had several different devices running at the same time and they're pretty close). it said. The alarm clock is terribly annoying! Yes, you can increase the threshold to 1100ppm, but you cannot turn it off. and guess when it starts? Downstairs in the middle of the night when I'm sleeping upstairs! Run down the stairs, press the button to mute the sound, come back upstairs, climb back into bed and the stupid ppm CO2 level drops to about 1099 and then back to 1101, and the stupid alarm starts again. Yes, I understand you don't like the crowd, but come on. I resorted to shutting down for the night. :( Also, it seems that it can only charge when it's on, even though it's plugged in. It's weird and annoying.
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