BELL+HOWELL BHDC1A, Руководство пользователя

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3. Using Your Doorbell
Note: If the doorbell captures an excessive number of events every
day the battery life will be reduced. Checking the live view or talking
through the doorbell will also reduce the battery life. To reduce the
number of events recorded each day, reduce the sensitivity level of
the motion sensor.
2.3 IR Night Vision Mode
The doorbell has built-in infrared (IR) LEDs for night vision recording -
giving you the ability to capture videos in a dark environment.
The infrared LEDs automatically activate when the level of ambient light is
low.
Note:
The videos recorded while the IR LEDs are enabled will be
recorded in black and white.