Microsoft M03-00035 Wireless Intellimouse Explorer with Tilt Wheel Black Leather Designed by ergonomic experts for your comfort. Longer battery life  many users average more than 6 months battery life 5 Programmable Buttons Wireless  no mouse cord or recharging station! Microsoft Wireless IntelliMouse Explorer with Tilt Wheel Technology makes scrolling easier, smoother, and faster than ever.