Dual Device ConnectionProviding Bluetooth(3.0/5.0) modes and 2.4GHz wireless USB receiver connection mode, the Bluetooth mouse can switch between connected Bluetooth devices and USB devices. Simple and convenient to work from PC to iPad, or from laptop to Macbook. The USB receiver is stored on the back of the mouse, plug and play. 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