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The main difference between devices is the type of installation. AV-04FD is a panel with flush-mounting installation, and AV-04SD requires wall-mounting installation.
Call button backlight statuses
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The call button blacklight can display the following situations:
- permanently lights in standby mode;
- blinks rapidly during a call;
- blinks slowly during a conversation;
- blinks rapidly twice when the lock is opened.
Appearance
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