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■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. ■improved pointer tracking by thorough Optimization of ball color, coating layer thickness, silver powder amount and particle size. ■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. ■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 devices: Bluetooth4. 0. Windows OS and Macintosh OS that support hogp. ■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/1500 counts (can be switched) ■button: 5 buttons with wheel ■external size: 7. 37cm/ 2. 9inch (w) x 8. 99cm/ 3. 5inch (D) x 4. 13cm/ 1. 6inch (H) ■Weight: mice weight 77G without battery wait