Dubbed as the smallest wireless mouse available on the Japanese market today is the E-Blue Pequeno (Pequeno means small). It measures 38×68×28mm and weighs only 35 grams. It features three different resolutions including 400dpi,800dpi and 1600dp with a battery life of 21 hours. I personally like a mouse that fits my hand comfortably but if your simply looking for the smallest mouse you can find to save space or because you have small hands you can buy these now for $63.63 at GeekStuff.