·The perfect fit for your hand Choose 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, upgraded You’ll 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 focus more on what you need to get done. Scrolls smarter. Fits better. The SmartWheel delivers adaptive scrolling that automatically shifts from line-by-line precision to hyper-fast spinning with a single flick. Paired with SilentTouch technology, it reduces click noise by 90% to keep your workflow quiet and smooth.
