Please see the outdoor motion sensor FAQ. It should help answer your question and you can ask any follow ups there. I don’t want this thread to go off topic.
I am looking for outdoor motion sensors to monitor my yard.
I bought a pair of the Aeon Labs Aeotec Z-Wave Multi-Sensor and am quite unhappy with them. Even on the lowest sensitivity setting it randomly sends alerts, some perhaps due to clouds changing the lighting (even though PIR is not supposed to be susceptible to this) and others I can’t explain at all. With several false alerts a day this thing is just useless. The Smartthings Motion sensor works great, I have some in my house, but it is indoor rated only. The Schlage / Nexia motion sensor is also indoor use only.
I am hoping someone has come across an outdoor rated motion sensor they have been able to pair with the Smartthings hub.