Roller PlusTrackball is a mouse's alternative, which can be used by people with motor disabilities.

• locking of the horizontal and vertical axes: grey buttons on the top at the center  
• left click: grey button on the left
• right click: grey button on the right
• "double click:  grey button  down on the left 
•  to move pictures and text areas: blue button down on the right
• speed control (5 speeds available):  on the left bottom 

On the box is fixed a finger's guide to make the use of the ball and the buttons easier.

Installation
No software is necessary. You connect it with USB or PS2. 

Dimensions
134x215x67mm.  These dimensions allow a better stability of the arm.

Others adaptations 

• each button can be changed by a contactor (except the blue one).
• you can connect more contactors with a Jack or another optional interface.
• there is another product: trackball is replaced by a joystick: Roller Plus Joystick, which is more efficient!