Built-In 700mah High Quality Rechargeable Lithium Polymer Battery, Standby time increased by 40%. Which contains a protection board to effectively prevent short circuit, overcurrent, overvoltage, overcharge and overdischarge, and extend battery life. When you leave your mouse more than 5 minutes, it will automatically get into sleep mode which saves electricity of the mouse, and click any button for waking up the mouse again. Silent Click: Silent clicking design for left and right button fits the circumstance for using the mouse in public, such as library, dormitory, office and so on, and apart from blue light indication during recharging and light off after full recharge, This design results worry-free for disturbing others. Ergonomic Design: The bluetooth mouse is designed for right-handed user for the best hand feeling. Six efficient buttons and three adjustable DPI level (1000/1200/1600) that allow you to freely control the mouse speed. Tri-Mo