HIKVISION DS-KB8113-IME1 Series - Page 27

Note
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Besides the indoor  you can also unlock the door by the master  the client
 and the web.
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When the video intercom between you and the resident is realized, you can speak to the
resident, and the live view of door  will be displayed on the connected indoor 
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When live view of door  is displayed on other devices or door  is calling resident,
the door  will detect the brightness of video. When the brightness is lower than the
expected threshold, the supplement light will be enabled.
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When the supplement light is enabled, the backlight of key will be auto-enabled, otherwise,
the door  will detect the brightness of live view and enable the backlight of key when
the brightness of live view is lower than expected threshold.
DS-KB8113-IME1(B) Series Vandal-Resistant Door  User Manual
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