This optical Tiny Mouse has a playful appearance and is about half the size of a standard computer mouse - just right for smaller hands.The colored dots on the buttons help out children who haven’t quite mastered their lefts or their rights.
To further reduce a preschooler's confusion with all the buttons, you can place a raised sticker, like an adhesive-backed earring, on the left mouse button so the child can feel where to click.
Source: Tiny Mouse Optical | via