Notice: This mouse dont need to use AA battery now .it have battery inside the mouse!you just used USB cable charging!!!! now did not need to worried to buy batteriesagain again! This wireless mouse vertical ergonomic design for you, help you get rid of tireness after long use of the wireless mouse. Care more about your health. Avoid carpal tunnel syndrome. Features: 1:2.4GHz Wireless Connectivity USB receiver & rechargeable mouse usb cable included 2:Built in rechargeable battery600MA 3:Ergonomic designed to remit and prevent carpal tunnel syndrome. 4:Optical laser technology for precise control 5:User convenience with wow-pen's signature, pen-grip comfort. 6:L/R mouse buttons, 2 thumb buttons, and a clickable scroll wheel , dpi button. 7:You pick the hand position that best suits you. Plug and play, compatible with Mac. Specifications: Item type: Ergonomic Optical Mouse IC: PixArt 3065 Movement speed: 28IPS Refresh rate: 3000FPS Acceleration: 10G Key life: 5 million times Resolution: 800dpi;1600dpi;2400dpi. Battery capacity: 600mA lithium battery Button: 4 buttons and 1 wheel middle buttonand dpiadjusrable Maximum operating range: 10m Charging cable Length: 70 cm Color: Black+Red,Gray+ Red. Material: ABS SystemRequirements:Windows 98/Me/2000/XP/Vista/Win 7/Win8/win10or latest. Item weight :140Including the charging cable and USB receiver weight Item size:12.5*6.5*7.5cm Item weight:92g Package size:15.5*8.5*8.4cm Package weight:157gIncluding the weight of the packaging box Package includes: 1 x Mouse 1 x USB Receiver 1 x USB Charging Cable 1 x English User Manual