Newcon Optik NVS 6 - Manual (Page 16)

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The ABC automatically reduces the voltages to the micro
channel plate (MCP) to keep the image intensifier's brightness
within a set limit. The effect of this function may be seen when
rapidly changing from low-light to high-light conditions, the
image gets brighter and then after a short delay, dims slightly to a
constant level.
The BSP function reduces the voltage to the photocathode when
the goggles are exposed to bright light sources.
The BSP feature protects the image intensifier from damage and
enhances its life; however, it also has the effect to lowering
resolution. Therefore, under bright conditions, when you would
not, formally, use the goggles, the image produced is not sharp.
1.6.5 Low-battery indicator
Electrical power for the low-battery indicator is drawn from
either compartment, whichever has the high voltage. When
activated, the low-battery indicator light blinks ON and OFF.