This just may be the smallest mouse ever, just like they are claiming. You may even look silly using it. It measures just 38×68×28mm and weighs 35 grams. The e-blue PEQUENO from OTAS not only claims to be the smallest, but also the lightest wireless mouse available on the Japanese market today. The 2.4GHz mouse features three different resolutions (400dpi,800dpi and 1600dp) and a battery life of 21 hours. It’s compatible with USB 1.1 and 2.0 and runs on Windows ME/2000/XP/Vista or Mac OS X 10.2 and higher. It will cost you $63.