Specifications: 1:Item type: Ergonomic Optical Mouse 2:Resolution: 2400dpi. 3:Button: 4 buttons and 1 wheel (middle button) 4:Dimension: 100*80*70mm 5:Maximum operating range: 10m 6:Charging cable Length: 50.5cm 7:Color: Black 8:Material: ABS 9:Keystroke life: 10 million 10: system: optical 11:System Requirements: 98/Me/2000/XP/Vista/Win 7/Win8. 12:Item weight :133g Features: 1:2.4GHz Wireless Connectivity (USB receiver & rechargeable mouse usb cable included) 2:Built in rechargeable battery 3:Ergonomic designed to remit and prevent carpal tunnel syndrome. 4:Optical laser technology for precise control 5:User convenience with -pen's signature, pen-grip comfort. 6:L/R mouse buttons, buttons, and a clickable scroll wheel 7:You pick the hand position that best suits you. Plug and play, compatible with and PC Note:  1, USB cable can only be used for charging. It can not be used as wired mouse. 2, The mouse can be used while charging, but you should make sure that the USB receiver is plugged into the computer and the mouse switch is turned on.  Wireless Mouse 2.4GHz gaming game mouse Ergonomic Design WOWPEN Vertical mouse 2400DPI JOY Wrist Pain USB Mice For Laptop PC？ Notice:this mouse dont need to use AA battery now .it have battery inside the mouse!？you just used USB cable charging!!!! now not need to worried to buy batteries？again again! This wireless mouse vertical ergonomic design , help you tireness after long use of the wireless mouse. Care more about . Avoid carpal tunnel syndrome Package includes: 1 x Mouse 1 x USB Power Adapter 1 x USB Charging Cable 1 x English manual" Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allo