One-window monitor mode, click this button to display
assistant function: PTZ control and image color.
Backspace function: in numeral control or text control,
press it for 1.5 seconds to delete the previous character
before the cursor.
In motion detection setup, working with Fn and direction
keys to realize setup.
In text mode, click it to switch between numeral, English
character (small/capitalized) and etc.
In HDD management interface, you can click it to switch
HDD record information and other information (Menu
prompt)
Realize other special functions.