The A4Tech has produced the Battery Free Wireless optical mouse. It does not need battery to power it. Electromagnetic induction technology is used to power the mouse via the included “smart” mouse pad. This special mouse pad is connected to the computer’s USB port and provides power to the mouse. Optical wireless mouse contains good features such as a zoom in and zoom out button, vertical/horizontal scroll button, and a customizable button. It comes with 1 year warranty , costing $29.99.