this post was submitted on 28 Feb 2026
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mmWave RADAR travels through 4" drywall insulated walls! (old.reddit.com)
submitted 2 days ago by bot@lemmit.online to c/homeassistant@lemmit.online
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The original was posted on /r/homeassistant by /u/Few_Peak_9966 on 2026-02-27 21:39:24+00:00.

Stupid things lead to revelations. I'm not sure if the use case....but:

I temporarily disconnected my Apollo MSR-2 and put it back. It was slower to respond afterwards. Then i started to notice the light in the bathroom would turn on when I was in the utility room. 2 days later, i noticed i had faced the MSR-2 facing the wall towards the utility room rather than the open bathroom. Flipped it around and all is well.

So...4-6' on the other side of an interior wall and movement triggered my mmWave RADAR.

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