These keyboards are highly sought after due to the fact that they can pair with any Logitech Unifying remote dongle. That means you can have several different Logitech devices working together off one single USB port.
These do not include the USB dongle, but are meant to be used in conjunction with a mouse that already has the unifying receiver dongle.Unifying receiver not included.Uses 2AA batteries which are not included.
Batteries generally don't need replacement more than once per year.