How to use Sony dock speaker?

My sister have me her old one. I have an iPhone 4S. It connects. When it does, it charges, but I can't find out how to make the sounds coming from my phone come out from the speake. The radio works tho.

It's a ICF CS10iP

Make sure it is on the right source, maybe it is on radio mode and not on the phone input.

Maybe it's a little broken. Tilt the phone forward

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