Ergonomic design: You can choose the trackball mouse angle that suits you according to your needs, 0° and 18°. Proven: The 18° design is more in line with the natural drooping wrist angle of sitting posture, especially for people who use computer mouse for a long time, giving you a more comfortable experience Precise thumb mouse: SABLUTE trackball mouse no longer needs to move the arm to control the cursor, but by turning the trackball, which will effectively reduce the fatigue and burden of the wrist and arm, and will not affect your efficiency even in a small space Multi-device wireless connection: Plug and play. This wireless mouse can connect to three devices at the same time via Bluetooth and USB, and can switch freely between PC, laptop and iPad with just one click - no delay, thereby improving work efficiency. Compatible with Windows, Android, Mac OS PC laptops, desktops and other devices