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 control5: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 Mouse2:Resolution: 800dpi;1600dpi;2400dpi.3:Button: 4 buttons and 1 wheel (middle button)and 2 dpi (Adjustable )4:Maximum operating range: 10m5:Color: Black+Red6:Material: ABS7:Button life: 5 million times8Power 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*7cm11:Item weight:80g(Including USB receiver weight)12:Package size:12.2*8.7*8.3cm13:Package weight:117g(Including the weight of the packaging box) Package includes:1 x Mouse1 x USB Receiver1 x English User Manual Three-level power saving mode:1: Three seconds into the first sleep light flashing continuously2: 1 minute or so to enter the secondary sleep, intermittent flashing lights3: 8 minutes or so, go to level 3 sleep, the light goes out