Mouse Included: No Normal Keys: 83 Function Keys: 5 Power Supply: Lithium-ion Rechargeable Battery Operating Time: 10 hrs for constant usage Distance: Within 10 meters Operating System Supported: MS Windows 98/ME/2000/XP/Vista/Windows 7 Mac OS X (v10.2 or later version) Linux Dimensions: 5.59" x 3.46" x 1.14"