The Logitech M570 Wireless Trackball does NOT have a USB port. It does however, come with a Logitech Unifying receiver. This is a small USB device which plugs in to your computer's USB port. The receiver allows the trackball to connect wirelessly. As an additional benefit, one receiver can be paired with up to six (Logitech) Unifying devices at a time. For example, I use it to connect both my M570 trackball and K800 wireless keyboard. For more information, visit the Logitech support site: https://support.logitech.com/en_us/article/Connect-device-to-a-Unifying-receiver
Logitech - K800 Full-size Wireless Illuminated Keyboard - Black
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