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Features: 1:2.4GHz Wireless Connectivity (USB receiver) 2: 2 x AAA battery version (not included) 3:Ergonomic designed to remit and prevent carpal tunnel syndrome. 4:Optical laser technology for precise control 5:Easy to use, comfortable to hold, prevent mouse hand. 6:L/R mouse buttons, 2 thumb buttons, and a clickable scroll wheel , 2 dpi buttons(dpi +/dpi -). 7:You pick the hand position that best suits you. Plug and play, compatible with Mac. Specifications: 1:Item type: Ergonomic Optical Mouse 2:Resolution: 800dpi;1600dpi;2400dpi. 3:Button: 4 buttons and 1 wheel (middle button)and 2 dpi (Adjustable ) 4:Maximum operating range: 10m 5:Color: Black+Red 6:Material: ABS 7:Button life: 5 million times 8：Power supply: 2 x AAA battery (batteries not included) 9: System Requirements:Windows 98/Me/2000/XP/Vista/Win 7/Win8/win10 or latest. 10:Item size:10*8.5*7cm 11:Item weight:80g(Including USB receiver weight) 12:Package size:12.2*8.7*8.3cm 13:Package weight:117g(Including the weight of the packaging box) Package includes: 1 x Mouse 1 x USB Receiver 1 x English User Manual Three-level power saving mode: 1: Three seconds into the first sleep light flashing continuously 2: 1 minute or so to enter the secondary sleep, intermittent flashing lights 3: 8 minutes or so, go to level 3 sleep, the light goes out