STEINEL IS 2180-2 Operating Instructions Manual page 17

Basic reach settings
Examples
16
The lens of the IS 2180-2
is divided into two detection
zones. One half covers
a max. reach of 5 m, the
other half a max. reach of
12 m (when installed at a
height of approx. 2 m).
After fitting the lens (press
lens firmly into the channel
provided) you will see the
max. reach setting (12 m
or 5 m) at the bottom right.
Using a screwdriver, the
lens can be unclipped from
the groove at the side and
re-positioned for the reach
you require.