A better mix of precision and comfort-with designed-for-Web scrolling. Designed for how you use the Web, our newest micro-precise scrolling makes reading your Facebook®, shopping Amazon® or scrolling through Google® searches easier. Tilting the wheel left or right moves you backward or forward on the Web. Its feel-good, contoured shape and textured rubber grips help keep your hand happy-even after long hours. With up to 18 months of battery life, it reduces the hassle of changing batteries. The tiny Logitech Unifying receiver stays in your laptop and lets you add compatible wireless devices to the same receiver. Connector/Port/Interface: USB; Left/Right Hand Use: Left/Right; Mouse Technology: Laser Sensor.