Havit HV-MS989GT Wireless Mouse Features: -Advanced 2.4GHz wireless technology, the effective working distance of up to 8 meters. -Fast and accurate positioning when you are using it. -Ergonomic design, it can be used by both left or right hand according to people?s using habits. -Built-in auto sleep function. -Easy to install, plug and play. -MINI receiver can be hidden inside the mouse, very convenient and portable. System Supported: Windows 2000/XP/Vista/ Windows 7/ Windows 8/Windows 10/Linux/mac Parameters: -Wireless Technology: 2.4GHz -Wireless Distance: 8m -Number of Keys: 4 -Resolution?800-1600DPI -Key life: 1,000,000 times -Power supply: 1*AA (Alkaline batteries are recommended) -Box Size: 104*58*37mm Note: -USB Dongle is inside Battery Cover -In order to protect the mouse, please don?t use the mouse on rough surface. It?s helpful to use it with a good-quality mouse pad. -The light of the mouse bottom is very strong, please don?t put it towards to your and others? eyes. -The component parts of the mouse are from concise electronic parts, please pay attention not to twist or dissemble the mouse; otherwise its service life could be shorter.