?The mobile trackball mouse is the compact design and easy to take your office and your home. ?index finger operation Type with a wide range of finger movement and comfortable cursor operation. ?The trackball mice adapts less noise switch. You can use it in quiet situation such as business meeting. ?it adopts Optical sensor mounted with reflection lens for sensor to detect movement. ?improved pointer tracking by thorough Optimization of ball color, coating layer thickness, silver powder amount and particle size. ?The large artificial ruby is 2. 5mm in diameter and is naturally resistant to smudges and fingerprints to minimize wear and tear and improve control and comfort. ?it is mounted "forward" And "back" Buttons is useful to search web pages. ?button function assignments can be changed using the Elecom Mouse Assistant, which can be downloaded for free in Elecom HP. ?The pointer movement speed can be switched between two levels of 750/1500 counts. ?as it is easy to remove the ball, It is designed to facilitate maintenance of the ball and the ball receiver inside. ?a semi-hard case with a special design protects the trackball mouse during the mobile purpose. ?as the receiver can be stored in the mouse body, It is convenient to carry and reduces the risk of losing the receiver. ?a power switch on the back of the main unit prevents battery consumption when not in use. ?it equipped with a battery level indicator Lamp. ?support device: Windows OS and Macintosh OS that have the USB interface. ?support OS: Windows 10, Windows RT8. 1, Windows 7, Mac OS Mojave (10. 14). you need to update the newest version OS and install service packs. ?resolution: 750/1500 counts (can be switched) ?button: 5 buttons with wheel ?external size (mouse): 6. 19cm/ 2. 4inch (w) x 9. 39cm/ 3. 7inch (D) x 4. 02cm/ 1. 6inch (H) ?Weight: mice weight 83G without battery wait