?All-Day Comfort?Shaped to encourage a more hand posture, wrist, and forearm posture, our ergonomic mouse reduces muscular strain by 10 percent compared with a traditional non-vertical mouse ?Efficient Navigationt?The rubber wheel offers line-by-line scrolling precision through large spreadsheets or images, featuring a convenient middle click. The high precision tracking and forward/backward buttons offer smooth, responsive cursor control for ideal navigation on almost any surfaces ?24-Month Battery Life?Install two 1.5V AAA batteries (Not included). Our vertical mouse can works up to 24 months without changing the batteries thanks to the on/off switch button and auto-sleep power-saving mode ?Easier Handling?This ergo mouse is additionally equipped with soft materials. Conveniently the mouse product is suitable for the majority of hand sizes. With this product click noise free, effortlessly and responsively with virtually no lag delayed ?Easy To Install?Simply insert the batteries. Plug the USB receiver located on the bottom of your mouse into computer. Switch on the power button and you’re good to go. Our carpal tunnel mouse works with your desktop and PC, Windows XP/Vista/7/8/10/Linux, Mac OS X