Kensington Pro Fit Mid-Size Right-handed Wireless Mouse with Nano Receiver (K72405US) Compact size for travel convenience, clutter-free wireless technology and storable nano receiver High-definition optical sensor (1750 DPI) for responsive control Ergonomic right-handed design, has scroll wheel with middle button and pointer speed quick-select 2.4 GHz wireless for long range with minimal interference Extended battery life up to 12 months; Windows 8 compatible