The Small, Compact, And Lightweight WM123 Optical Wireless Mouse From Dell Is A Wireless Optical Mouse For Everyday And On-The-Go Use That Offers Strong Battery Life. It Is Designed To Help Users Decrease The Clutter In Their Workspace Through The Use Of A Plug-And-Play Wireless RF Connection. This Mouse Provides Consistent Performance And A Reliable Wireless Connection Through Its USB Anchored RF Wireless Dongle. Its Plug-And-Play Capabilities Also Help Allow For User-Friendly Installation So This Mouse Can Be Set Up In Minutes, Without Any Software Or Complicated Setup Requirements. Key Features (from Specification): Wireless RF Connectivity USB Dongle Optical Tracking 3 Buttons Designed For Right Or Left Hand Use USB Type A Package Includes: 1 X Mouse