Newcon Optik NIGHT VISION ATTACHMENT NVS-33 - Manual (Page 33)

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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.