Elecom DEFT Trackball Mouse - 2.4GHz Wireless

Trackball mouse with 8-Button Function Designed with a high-performance gaming optics system sensor and lens This trackball mouse bases on ergonomics, effectively reducing user’s wrist strain and muscle pain 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 System requirements: 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 Resolution DPI: 750/1500 count (switchable) Size & Weight: Size: W3.7"(94.7mm) X L4.9"(124.4mm) X H1.9"(47.9mm), Weight: 4oz(without battery) Connectivity: wireless Battery requirement: 1 X AA battery(Included)- Battery Remaining Light Lamp equipped English Manual & Mouse Assistant Software can be download for FREE. Please check the manual in the box or can be found on Amazon Product Page. Listed as 【Technical Specification：User Manual [PDF ]】