1 Lithium Metal batteries required.

Make sure this fits by entering your model number. ? Rechargeable Wireless Mouse: Built-in 700mAh high quality rechargeable battery means you can recharge whenever you want. 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 (P.S. Please recharge for 1 hour when the mouse is new before use). ? Silent Click: Silent clicking laptop mouse 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