WIDE COMPATIBILITY - Compatible with most system including Windows 11/10/8.1/8/7, macOS 10.12~10.15, Mac OS X 10.3~10.11, Chrome OS. ?Notice: All SANWA Products provide the same high quality after-service as in Japan, including a 1-Year Worry-Free Manufacturer Warranty and free lifetime technical support.?. 4 ADJUSTABLE DPI LEVELS - You can adjust the mouse among 4 resolutions of 400 / 800 / 1200 / 1600 DPI depending on your needs. When the count switch button is pressed, the DPI is notified by the number of flashes. Comes with Back and Forward buttons that are convenient for browsing the web. EASY TO PROGRAM - Install the SANWA Trackball Utility onto your computer to configure the Trackball Mouse's buttons. It gives you easy access to assign mouse buttons for several types of functions, such as shortcuts, launch browser, volume up & etc. ERGONOMIC DESIGN - Places your hand in a natural wrist and arm position for smoother movement and less muscle tension. Comfortable finger rests just fit in the palm of your hand. No driver required. As long as your device supports Bluetooth, it can be connected to the trackball mouse through Bluetooth. Bluetooth version 5.0, stable connection and power saving. Once you get used to it, you will love it!. TRACKBALL COMFORT - Quipped with a 34mm trackball and 5 buttons, you will not need to mouse around to move the cursor as thumb controlled trackball stays in one place. Not only work on flat surfaces, but also on your leg, sofa and other surfaces as well. A full control of everything is within your fingers.