J-Tech Digital Wired Ergonomic Vertical USB Mouse with Adjustable Sensitivity (600/1000/1600 DPI), Scroll Endurance, Removable Palm Rest & Thumb Buttons [V628]

Ergonomic Wireless Design: The J-Tech Digital V638’s comfortable, ergonomic “handshake” design greatly reduces arm/wrist/hand strain while providing relief for carpal tunnel syndrome. Back/forward thumb buttons provide extra convenience. (Button functionality can also be changed or reassigned using third-party software.) Works on most non-metallic surfaces. The built-in lithium battery is fully rechargeable.