You are right. I did the breath test first thing when I opened it (I don't know why). At the hightest and second-highest sensitivity settings, my breath would make it beep. I thought it was weird, but didn't think too much of it. What you are saying now makes sense.

It's going back tomorrow.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280