Thumb-Controlled Navigation : Your thumb becomes the driver for cursor control, ensuring smooth and precise movements. Ergonomic Comfort Design : Designed to fit comfortably in your hand, reducing strain and fatigue for a better working experience. Plug And Play Compatibility : Easy setup with desktops and laptops, requiring no additional software installation. Muscle Harm Reduction : Our ergonomic design helps prevent common issues related to long-term mouse use. 4D Page Scrolling : Navigate through documents and web pages effortlessly, enhancing your browsing experience. Introducing our Thumb-Controlled Navigation Wireless USB Trackball Mouse, crafted for comfort and efficiency. The ergonomic design minimizes muscle harm, allowing for extended periods of use without discomfort. With plug-and-play compatibility, you're set to go on any device, while the 4D page scrolling ensures effortless navigation through your documents. Experience the joy of precision and ease in every click. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.