Night Owl Night Scope NOXM50-DG, Owner'S Manual

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Q
There are 3 levels of infrared (IR) intensity and an IR off mode. The default
setting at power-up is low intensity. Quick press < > to intensify select the
IR level; each successive press cycles through the IR intensify levels, from low
to medium to high to off. Once to cycle through low intensity, medium intensity,
high intensity and IR off. It is suggested to start with the lowest level. A higher
IR intensity is needed for viewing in darker environments or when viewing
more distant objects. More battery power is consumed at higher IR intensities.
Two brand new CR123A batteries can power continuous operation for
approximately 150 minutes.