If you own an older style desktop and need the PS2 connector, you can find many of the new USB styles that also include a PS2 adapter. This allows you to plug into the PS2 outlet on your older desktop to use your mouse. You can also purchase many styles of wireless devices that come with a remote sensor that plugs into the USB port. These items use batteries to operate with the sensor device, which can be rechargeable batteries. Since the mouse is a frequently used item, getting the rechargeable type of batteries will save you a lot of money in the long run. Or you can still use a corded mouse like the Logitech RX300.