Ergonomic Mouse Designed for Optimal Comfort -- This Trackball Mouse is ergonomically shaped to follow the natural curvature of your hand. Its contoured design fits comfortably in your palm, reducing strain on your hand and wrist. Enjoy maximum comfort during extended use | Wireless Mouse with Ball Enhances the Efficiency -- The seenda Wireless Mouse features a thumb-accessible trackball, allowing for effortless navigation and control. Keep your hand stationary and use your fingers or thumb to operate the trackball, eliminating the need for constant mouse movement | Smooth & Precise Tracking on Various Surfaces -- Its advanced sensors detect even the smallest movements of the trackball, translating them into accurate cursor movements on your screen. Additionally, this mouse can track on various surfaces, including desks, tables, fabrics, and even your own hand | 3-Device Connection Via 2.4G USB or Bluetooth -- It can connect to up to 3 devices using either the 2.4G USB receiver or Bluetooth (without the receiver). Switching between your home PC, work laptop, and tablet is as easy as a single click (the mode control button can be found on the back of the mouse) | Enhanced Convenience with Rechargeable Design -- It comes with built-in batteries that can be easily recharged using the included charging cable. Say goodbye to constantly replacing disposable batteries. With a fully charged battery, you can enjoy extended usage without the worry of running out of power | Pls kindly note: "Forward & Backward" function is not fully compatible with Mac OS