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 Receiver 1 x English User ManualThree-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 Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.