tele means far, distance, or from afar
phon means sound
When you put them both together it means something that lets you hear sound from a distance.
So now that you know that, look at some other words that have tele:
telegraph- graph means writing. A telegraph is a written message that is sent a long distance by Morse code.
television- I'm sure you know that vision means something you can see. You can see something from a distance.
And some words that use phon:
microphone- micro means small. We use a microphone to capture a small voice and make it large.
homophone- homo means same. A homophone is two different words that sound the same, like here and hear.