Thank you for viewing. [Design to Reduce Wrist and Arm Strain] This design minimizes the strain on your wrists and arms because you don't need to move the mouse. Do you sometimes feel pain in your wrists or shoulders after using a mouse for a long time? We highly recommend a trackball mouse to address these concerns. It reduces fatigue and doesn't take up much space. EWIN trackball mice allow you to control the cursor by rolling the ball with your thumb. They also feature an ergonomic shape that fits comfortably in your hand, promising comfortable operation. It's the perfect solution for those who feel strain on their wrists and shoulders. Please try the EWIN trackball to reduce strain and achieve efficient and comfortable work. [Abundant Multi-Button Functions] This trackball mouse, which excels in comfort and ease of use, is equipped with left and right buttons, a scroll wheel, and a DPI button that allows you to change the count according to your usage. With this DPI button, you can switch the cursor speed in 5 stages: 200 counts, 400 counts, 800 counts, 1200 counts, and 1600 counts. This allows you to effortlessly handle everything from detailed work such as Excel and drawing to tasks that use a wide screen. It also has forward and backward buttons (※not compatible with Mac) convenient for browsing the internet, making it easy to browse web pages. [Long Battery Life of Up to 18 Months] With power-saving technology, you can comfortably use it for up to 18 months without replacing the battery with just one AA battery. It also has a convenient status indicator. [Quiet Design to Reduce Noise] The design quiets the clicking sound, reducing noise by over 90% compared to conventional models. You can concentrate on your work without worrying about your surroundings, even in quiet places like cafes and libraries. [Wide Compatibility] Compatible with Bluetooth-enabled devices running Windows 8.0, Windows 10, Windows Vista, Mac OSX 10.10 or later, Android 4.3 or later, and iOS 8.0 or later. It can be used with a wide range of devices.