Newcon Optik 7x50 AN Binoculars with Compass and Reticle - Manual (Page 21)

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6.8 Compass (MC model only)
The AN 7x50MC model has a built-in analogue compass,
which is visible via the eyepiece (A, Fig.2).
This scale can be illuminated via a projector window (8,
Fig.3). If natural illumination is not sufficient pressing the
illuminator button (7, Fig.3) will lightup the scale from
inside. Internal lighting is powered by two tablet batteries
(LR 43 type).
If compass scale illumination by ambient light distracts
observation – cover the projector window (8, Fig.3) with
index finger.