Could be better.

What I like: It doesn't have to be plugged in, runs on a battery that they say will last 10 years. We'll see. I can set it on a shelf instead of mounting it to a wall. If there is a dangerous level of CO it will display. I hope. What I don't like: It will only display CO level if it is above some mystery level. If the level is low, or zero, it won't display that. If you try to display the CO level, and it is low, the device goes into test mode. Very annoying!! I don't need a room temperature display, I would rather see the actual CO level, even if it is zero.

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