Being wireless, it needs a USB port for the wireless transmitter.
Being wireless, it needs a battery. This particular model includes a rechargeable battery and a recharging cord. Every so often, I have to plug the cord into a second USB port, and then attach it to the mouse through its mini-USB connector.
For several hours then, I have a cordless mouse connected to my computer through a cord, taking up two USB ports. It just doesn't seem right to me.
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