Type:AAA type, Installed Qty:1, Interfaces:1 x USB - 4 PIN USB Type A, Features:Scrolling wheel, Nano wireless receiver, Movement Detection Technology:Optical, Interface:2.4 GHz, Connectivity Technology:Wireless, Compatible with Windows 7:"Compatible with Windows 7" software and devices carry Microsoft's assurance that these products have passed tests for compatibility and reliability with 32-bit and 64-bit Windows 7., OS Required:Linux Kernel 2.6 or later, Microsoft Windows Vista / XP / 7, Apple MacOS X 10.5 or later