The Logitech MX 620 lets you fly through long documents at hyper speed with the nearly frictionless alloy scroll wheel. Shift to precise click-to-click scrolling when you want to navigate lists, slides and image collections. Laser tracking delivers smoother, more responsive cursor control than standard optical mice. 2.4 GHz digital technology provides an uninterrupted cordless connection. You won't be caught out by flat batteries with 1-year battery life and an indicator light to warn you when power is low. Advanced one-touch search button instantly displays results from search engine and forward/back buttons speed up web browsing.