Wired Optical Mouse

A wired optical USB mouse

Many typical notebook users find the built-in touchpads included with most notebooks less than useful. That explains why so many of them prefer to use a classical mouse as their pointing device instead. These days, most of them hook up through a USB port.

A typical wired mouse has a power consumption rating of about 0.5 watts (5 V/100 mA). One hundred milliamperes is the maximum additional current that a mouse can draw, according to the USB 2.0 specification.