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Keep away from sources of heat, such as heating
appliances, sunlight or central heating. Do not keep
the device at temperatures higher than 60
o
C (140
o
F).
Switch off the unit and remove the batteries during the
extended periods of non-operation.
Do not apply excessive force or pressure to the lens
assembly, this may damage fragile elements and
thread connections.
Small dark and/or white marks may be seen in the
field of view. This does not affect the operational
capabilities of the device.
Do not remove the cover from the lens other than for
night-time operation.