Features: Comfortable Holding. Allows natural stretching to reduces fatigue when you use the mouse. Unique Structure and Finger Groove. Allows your fingers to stretch and force more evenly and the comfortable finger groove makes the fingers more fit the key surface. 2.4G Wireless Technology. This advanced 2.4G wireless technology allows for a perfectly lag-free data transmission from your gaming mouse to your system. Three Level DPI Adjustable. Support 3 level adjustable DPI, 1000-1600-2400DPI, you can choose the DPI level as you please, to meet different needs. Bionic Tire Type Roller. Rubber wrapping with skin texture and comfortable oblique scale design, increase friction with the fingers, and deliver clearer stop rhythm. Distributed Keys. The force distribution is more uniform, the pressure transfer is more accurate, the feel is more comfortable. Forward/Backward Key. Easy to browse files via the forward-backward operation, which can be performed via one click, saving time and effort. Comfortable Texture. Rubber oil process makes it more smooth and comfortable to touch. Specification: Brand: ZELOTES Item: Mouse Model: F-35A Keys Quantity: 6 Tracking System: Optical Frequency: 2405MHz-2476MHz Effective Distance: 10m / 32.8ft Operating Voltage/Current: 3V/4mA Button life: 3 million times Roller Life: 1.2 million turns Product Size: 110 * 75 * 72mm / 4.3 * 3 * 2.8inches Product Weight: Approx. 100g / 3.5oz Resolution: 1000-1600-2400DPI (Adjustable) Rate of Return: 250Hz Battery: 1 * AA (Not Included) Package Size: 11 * 9 * 7.5cm / 4.3 * 3.5 * 3inches Package Weight: 303g / 10.7oz System Requirements: For Windows:2000/ME/XP(x64)/Vista/7/8 For Mac OS X(over V10.4)