BakkerElkhuizen RollerMouse Red Plus - Manual (Page 4)

Before plugging in the unit take a moment to check the height
and angle of your keyboard, and find the arrangement that’s most
comfortable for you. The package includes keyboard risers
that can help you to achieve the correct angle and height
regardless of the type of keyboard you are using. The spacebar on
your keyboard should come just above your Rollerbar. To achieve a
proper ergonomic position, the top of the keyboard should be level.
The following examples show three different ways of arranging the
keyboard. These are typical configurations. Your set-up may vary.
Keyboard positioning
Example 1 -
Thick keyboard
Example 2 -
Standard keyboard - top of long riser is level
Example 3 -
Thin keyboard - top of long riser tilts down
Short riser
4
Short riser Long riser
Long riser Short riser