#Sonoff vs Aqara mmWave sensor
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I have neither. Sonoff is 5.8 mmwave. I have 5.8 mmwave devices. I find them too slow/not responsive enough in a big room. Aqara has AI Spatial Learning
If all you are looking for is a fancier motion detector than any cheap 24g/5.8g mmwave on Aliexpress will work.
If you are looking for something more such as setting zones, etc then the more expensive options will be better.
Reddit would probably be the best place to discuss what specifically you are looking for from a mmwave sensor