?The mobile trackball mouse is the compact design and easy to take your office and your home. ?Thumb-operated Type trackball mouse. It is similar to the regular mouse operations. ?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. ?it is improved the ball operation to mount the 2. 5mm diameter ruby ball. ?maintenance frequency is reduced by increasing the diameter of the support ball. ?The scroll wheel is designed to be able to turn more smoothly by tilting it 16 degrees according to the tilt angle of the trackball bod. ?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): 7. 37cm/ 2. 9inch (w) x 8. 99cm/ 3. 5inch (D) x 4. 13cm/ 1. 6inch (H) ?Weight: mice weight 77G without battery wait