That'll be the ambient temp.

They have a photocell built in but it's optional you can roll the pot off.

2 hours ago, james.wilson said:

rf ones mounted to places i cant get cables to for lighting and app alert as tech zones

What about battery tho , they awake all the time then? How long battery last , I might do the same for drive 

1 hour ago, Logan said:

Didn't those PIRs change sensitivity during the day and night?

You Google far to much 

52 minutes ago, al-yeti said:

What about battery tho , they awake all the time then? How long battery last , I might do the same for drive 

about 30 months not quite 3 years I didnt but you ma want a bracket. I use the pet lens too

6 minutes ago, james.wilson said:

about 30 months not quite 3 years I didnt but you ma want a bracket. I use the pet lens too

Still it's good tho , I got pet lens , never used them lol 

 

If I cover part of it will it narrow it's beam a bit or that doesn't really work?

Yeah should be fine