SIIG Wireless Mini Multimedia Trackball Keyboard (JK-WR0412-S1)
Wireless mini-sized multimedia keyboard with trackball and 3 button mouse function. Compatible with Windows 7 (32-/64-bit) / Vista (32-/64-bit) / XP (32-/64-bit) / Server 2003 & 2008 (32-/64-bit) / 2000 SP4.  Includes keyboard/mouse, USB wireless receiver, 2 AA batteries, and user's manual.