"NOTE: Depending on your computer model, the transceiver may be preinstalled in a USB port that is not visible from the outside of the computer."
Look up your user's guide from this page, HERE. Go to page 11:
http://support.hp.com/us-en/document/c04805273
That may be a Link 5 HP keyboard/mouse. Work great..... there is an on/off switch on the bottom of the Link 5 mouse, and maybe the keyboard. You may need to replace batteries, but try turning on first.
