Features: new and high quality. Vertical ergonomic design perfectly fits the natural contour of the wrist and the palm. Special designed finger slot. 3 adjustable DPI levels to customize your game play experience 400,800,1600 Optical laser technology for precise control. It has L/R mouse buttons, 2 thumb buttons, and a clickable scroll wheel. Rechargeable built-in battery will never require batteries and will be more convenient and practical for you to use. Built-in iron, making center of gravity more stable. Comfortable hand-holding posture of this product increases the control frequency of your mice, removes occupational carpal tunnel syndrome. 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: Color: black, black & blue, black & purple, black & silver grey Size: 102 x 72 x 82 mm Connection method: Wireless DPI: 1600 Connection port: USB 2.0 Button: left/right button, roller button, forward/back button, middle(on/off) button. Wireless range: about 10m Rating: 5V 10mA Charging time: about 2 hours Compatible with: Win98/2000/XP/VISTA/7/8/MAC Net weight: 116g Package includes: 1 x Wireless Ergonomic Vertical USB Mouse (battery is included) 1 x USB cable