The mouse should be of a size that can be comfortably gripped in a single hand by the user.
Additional Information: For a comfortable grip, the width of a rectangular-shaped mouse should be in the range between a minimum of 40 mm (1.6 in.) and a maximum of 70 mm (2.8 in.), the length between
70 mm (2.8 in.) and 120 mm (4.7 in.), and the height between 25 mm (1.0 in.) and 40 mm (1.6 in.).100