Fits medium and large size: Bigger size, same comfortable feeling. Contoured shape, sweat-resistant and skin-friendly texture provide the maximum comfort and support. 5 Adjustable CPI Level and 2 Polling Rate:Simple switch DPI level (800,1200,1600,2000,2400) for your different needs. 2 polling rate: 125Hz and 250Hz. Comes with a Nano receiver (No need any driver, simple plug and play) Strong Durability: The buttons are tested over 5000000 times keystroke for guarantee the durability. Long Working Distance:2.4GHz wireless technology and professional gaming chip (PAW3212) can perform longer working distance up to 33ft. Energy Saving: The automatic function will turn to sleeping mode for saving power when it keeps inactive for 15 minutes, battery life up to 15months. Wide Compatibility:Available for devices such as laptop, PC, MacBook and support Windows7/8/10/XP, Vista7/8 and Linux system