how does the overlap box work?

[gray pebble]

i'm having struggle figuring out how the 'extends' port works. i tried everything but couldn't seem to get a difference.

[jagged mica]

"Extents" is the scale of the box in the X, Y, and Z directions

[gray pebble]

are they in meters on inches because it still shows collisions no matter how far i am (i have "ignore objects" turned on and it still detects me everywhere)

[jagged mica]

meters, all circuit units are meters (or degrees if in rotation)