At 2" wide and 3" long, this cute mouse is a perfectly portable accessory for your laptop. The World's Smallest Mouse is a real, working mouse in smaller-than-standard size to pack easily in purse or briefcase. Includes ergonomic design and wireless feature; and this mouse is super space-saving and convenient. It uses 1 "AAA" battery (not included) and comes in a sleek blue color. Includes wireless connection (has it's own usb wireless receiver) and battery installation instructions. Recommended for ages 8 and older.