symmetrical ergonomic design adopt symmetrical ergonomic design, suitable for left or right hands and different holding positions, more flexible and comfortable, and will not fatigue after long-term use. hollowed-out honeycomb design this design meets the ventilation and cooling effect required by the game player for a long time playing, avoids the feeling of hot hands and palms during the game. it also has a cool visual appearance. exquisite texture the top cover of the mouse adopt delicate surface treatment technics, brings comfortable feel and delicate texture. lightweight design the net weight of this is about 69g, which can reduce the burden of hand, easy to control, provide smooth operation. plug and play powered by usb, plug and play, no driver required, convenient to use. specification: item name: wired mouse brand: model: aj390  color: black/white(optional) image sensor: paw3338 number of keys: 7 rate of return: 125hz-1000hz acceleration: 40g movement speed: 400ips support os: windows 2000/xp/vista/win7/win8/win10/mac item size: 12.9 * 6.7 * 3.8cm /5.08 * 2.64 * 1.5in(l * w * h) item weight: approx.69g /2.43oz packing list: 1 * wired mouse 1 * user manual