The Targus USB Retractable Optical Laptop Mouse contains several features for laptop users. Its high-definition optical sensor is responsive to mouse movements and accurately points to items on the screen. This accessory's main feature is the retractable cord, eliminating the hassle of tangled cords. It plugs directly into your laptop's USB port making this device very user friendly. Possessing a USB plug means there are no drivers to install or batteries to replace. This mouse is designed for extended period use, not only because there is a direct power source, but because it is ergonomically designed to provide comfort and support throughout the day.