CTX Virtual Technologies The VK200 KEYFOB Virtual Keyboard - Manual (Page 18)

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5. USING THE PROJECTION KEYBOARD
This product is used as a keyboard and mouse via
Bluetooth HID and USB HID.
5.1 KEYBOARD TYPING MODES
There are two keyboard modes available:
All Up
Factory default keyboard mode is “All Up” meaning
all fingers need to be raised above the key press
activation level in order to type.
Palms can rest behind the keyboard but all fingers
should be high enough so that ‘phantom’ key presses
are not recognized generally at least 4mm above the
table surface.
NOTE
If 3 or more fingers are detected at once a buzzing
sound will occur to let you know your fingers are
too low.