Microsoft 5000 4-Button Bluetooth Notebook Laser Scroll Mouse (White/Black) Microsoft Bluetooth Notebook Mouse 5000 General Features: Color: White/Black Portable, wireless mouse High Definition Laser Technology Ergonomic design 4-button design Scroll wheel (acts as 3rd button) Back button Battery life indicator (operates on two (2) AAA batteries, not included) 3+ months battery life Comfort for either hand