Hmmm
I have one of those too the first one looked like this:
http://images.iwoot.com/medium/kamrem_med.gif
ate batteries and hummed - I hated it.
Got it replaced with a later model that looked like this:
http://www.avukltd.com/images/big/8206.gif
Which was miles better. As jenky says you can teach it any signal and reprogram buttons.
Mine controls the TV, Video, DVD-PVR and Surround Sound amp. Don't know about SKY - I dont use it but I'd be amazed if it didn't
If only they made one that bleeped when you whistled like those old keyrings!