Office Optical 4000 DPI Graphite Right-hand RF Wireless + Bluetooth 10 m Scroll type: Wheel Buttons quantity: 5 Rubber grips Power source: Batteries 1 AA Alkaline Signature M650Upgrade your setup for all-day comfort and productivity.SCROLLS SMARTER. FITS BETTER.SMARTWHEEL SCROLLINGMake scrolling work for you with Logitech SmartWheel. Get line-by-line precision when you need to focus on the details, and scroll super fast when you just want to breeze through lengthy pages. Automatically switch modes with the flick of your finger.THE PERFECT FIT FOR YOUR HANDChoose the Signature M650 that fits you best. We recommend the M650 for small-to-medium hands, M650 L for large-sized hands, and M650 L Left for left-handed users. Unsure which mouse is right for you? Check out our sizing guide below.COMFORT, UPGRADEDYoull enjoy working with your Signature M650. Each mouse features a contoured shape, soft thumb area, and rubber side grips that keep your hand snug and in place. Get more comfort and fo