Feature: 1. Adopt ergonomic design, the mouse is specially designed for right-handed users to reduce muscle strain. Wrist pain, shoulder fatigue, carpal tunnel syndrome and tendinitis can all be relieved 2. 2.4GHz wireless technology can provide stable and reliable connection without any interference within a 360-degree range within 10 meters. Enjoy fast data transmission with the convenience of wireless technology 3. 3 level DPI (800/1200/1600) meets general and gaming needs, equipped with advanced optical engine, can provide faster response speed, smoother tracking and higher accuracy movement 4. Come with intelligent power saving, the independent on/off button at the bottom can effectively save energy 5. Easy to use, solid and reliable 2.4GHz wireless connection, just plug and play. The size of the vertical mouse will fit perfectly in the palm of your hand. You can carry with you without restrictions 6. Widely compatible with for Windows 2000/Windows XP/Windows 7/Windows Vista/Windows 98/OS X/Windows ME/Windows 8/Windows 10/etc. Specification: Item Type: Optical Vertical Mouse Connection with Computer: Wireless Optical Resolution: 1600DPI Number of Keys: 5 Keys Wireless Transmission Frequency: 2.4Ghz Adjustable Resolution: Three levels and below Operating Distance: Approx. 10meter / 32.8ft Wheel Direction: Four-way wheel Polymer Lithium Battery: 500mAh How to Use: 1. Turn on the mouse power switch 2. Insert the wireless USB head into the USB interface 3. Mouse can be usedSize: Approx. 72mm / 2.8in 97mm / 3.8in Height: Approx. 82mm / 3.2in. Package List: 1 x Mouse1 x Charging Cable1 x USB Head