Anti-Sweat & Ergonomic DesignE-YOOSO Large Mouse is made of anti-slip and anti-sweat custom material, built with a comfortable contoured shape that naturally fits big hands. The finger rests on both sides of the mouse provide additional support, every finger can hold comfortably for a long time. X-31 large mouse adopts a large size design, and also has forward and backward buttons, make your web surfing more efficient, perfect performance for more than 50,000,000 keystrokes! 5-Level 4800 DPI & 2 Kinds Polling Rate5-level DPI settings (800/1200(default)/1600/2000/4800), choose your comfortable speed for working. X-31 will move more precise by 125Hz(default) or 250Hz polling rate: Press the right button + the middle buttom for 3 seconds to switch polling rate. USB Plug And Play & Stable CursorUSB Nano Receiver can be stored within the back of the mouse, plug and play. 2.4GHz Wireless technology provides reliable connection, transmission distance up to 33ft (10m), which elimin