It's an audio-video receiver: meaning that you can hook up to it the audio (red & white RCA plugs) and video (yellow plug) from your cable / satellite box, VCR, DVD, and/or video game systems. The AVR then processes the currently selected audio signal, amplifies it, and then powers outboard speakers, while the video signal of the currently selected source can be output to a television.
It's also old enough that there is no manual for it available on HK's website.
If you would like to listen to radio or other audio from a CD player or iPod in a garage or kitchen, this, along with a pair of speakers, should do the job.
If you want to watch HD television and movies, or even DVDs, this AVR won't help.