2.4 GHz Rechargeable: Mouse built-in rechargeable battery, with a charging cable. No need to change batteries. 2.4GHz wireless technology to ensure fast and stable transmission, and longer working distance, reaching up to 33ft/10M. Silent & Ergonomic Design: Soundless design for the right and left buttons, help you build a quiet atmosphere without disturbing others. The heightened mouse cover with matting finish fits your palm perfectly. And the symmetrical design allows it to fit both hands. LED Breathing Light: 7 different color changes randomly while in use, offering soothing ambient lighting, creating cool and fancy atmosphere for working and gaming. It can be turn off by the bottom light switch if you do not need it.