About this item ✅《COMFORTABLE DESIGN》The mouse design is based on 6 different muscle and skeletal structures of the hands giving special emphasis to the folding actions of the hands to provide a new level of hand comfort. ✅《OPTICAL TRACKING TECHNOLOGY》The ELEOM "EX-G series" trackball provides precise cursor movement for superior accuracy so you can get where you want on the screen quickly with less hand movement, improving productivity and efficiency. It is very easy to move in any direction. ✅《FUNCTIONAL 8 BUTTONS》You can ign favorite function to each button by using "ELECOM Mouse istant" ELECOM Mouse istant will be available to download from ELECOM NET website. ✅《DPI CURSOR》Designed with a high-performance gaming optics system sensor and lens. The DPI button can easily change between 750(LOW) and 1500(HIGH) DPI, making the movements of your cursor faster or slower. The ball is held in place by the ball bearings, but can easily be popped out of the device, by pushing it through the hole in the bottom and it can be easily cleaned. ✅《PRODUCT DETAILS》System requirements: Windows 7, Windows 8.1, Windows RT8.1, Windows 10 or later (Horizontal scrolling function is not working in Windows RT8.1), macOS 10.10 or later, Size: W3.7"(94.7mm) X L4.9"(124.4mm) X H1.9"(47.9mm), Weight: 4oz(without y), DPI: 750/1500 count (switchable), Connectivity: , 1 X AA y(Included)- y Remaining Light Lamp equipped.