Think big: this mouse is ideal for anyone who works a lot on the go with a notebook and has large hands. Thanks to its slightly elongated shape, the 1620 is perfect for bigger palms without being too bulky for mobile use. The high resolution 1000 DPI sensor offers total control and maximum precision. Thanks to Rapoo\'s latest energy-saving technologies the 1620 lasts for up to 9 months on just a single AA battery, saving you from the hassle of changing batteries. System Requirements Windows(R) XP/ Vista/7/8/10, USB port Box Contents Wireless mouse, Nano USB receiver, 1 AA alkaline battery (installed), Quick Start Guide