The Signature M650 features SmartWheel scrolling that delivers precision or speed the moment you need it. Features Smartwheel Scrolling provides line-by-line precision for documents and super fast scrolling for long web pages. Choose the right design for your hand size thanks to the mouse's contoured shape and soft-to-the-touch thumb area. Connect instantly via Bluetooth or Logi Bolt USB receiver. Customize the side buttons for your favorite shortcuts with Logitech Options+.