device works very well I'm glad I bought it, now I know when the air quality reaches dangerous levels. The device must be constantly connected to the network, because the battery really does not last longer than 40 minutes. I would like more battery capacity. Other than that, I'm happy with the device and think the readings are pretty accurate. Update: He fell about 16 inches and hit the ground. Now the numbers are skyrocketing. A mistake and its garbage. Not very reliable.
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