Connects wirelessly to the Logitech Unifying receiver, which plugs into a USB port on the computer. When reading the description, this is explained... Logitech Wireless Keyboard K270 (USB, CH, Wireless)
"The Logitech Wireless Keyboard K270 provides a reliable wireless connection - no matter where you use your keyboard. The tiny Logitech Unifying receiver can stay plugged into your notebook all the time - without getting damaged during transport. And the same receiver makes it easy to add more compatible mice or keyboards - no need for a second USB receiver or another USB port. Logitech Advanced 2.4 GHz wireless technology gives you a virtually signal-loss-free connection up to 10 metres away. Wireless range is dependent on usage and environmental conditions."