Item Description: Features:1. Brand new and high quality.2. Vertical ergonomic design perfectly fits the natural contour of the wrist and the for palm.3. Special designed finger slot.4. Two options for left-hander and right-hander.5. 2.4 GHz wireless connectivity (USB receiver & rechargeable mouse USB cable included)6. 3 adjustable DPI levels to customize your game play experience - 400，800，16007. Optical laser technology for precise control.8. It has L/R mouse buttons， 2 thumb buttons， and a clickable scroll wheel.9. Rechargeable built-in battery will never require batteries and will be more convenient and practical for you to use.10. Built-in iron， making center of gravity more stable.11. Comfortable hand-holding posture of this product increases the control frequency of your mice， removes occupational carpal tunnel syndrome.12. Professionally designed for office staff and gamers. The right， left and roller keys are uniquely deigned on the side， which will make your hand under the most relaxing state during using. Thus， it reduces the fatigue of the hand.Specifications:1. Color: black2. Size: 102 x 72 x 82 mm3. Connection method: Wireless4. DPI: 400DPI-800DPI-1600DPI-400DPI5. Connection port: USB 2.06. Button: left/right button， roller button， forward/back button， middle(on/off) button.7. Wireless range: about 10m8. Battery: built-in rechargeable 800mA lithium battery9. Charging time: about 2 hours10. Compatible with: Win98/2000/XP/VISTA/7/8/MACPackage include 1 x 2.4G Wireless Ergonomic Vertical USB Mouse1 x USB cable1 x Connector