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) 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