Speakers / music centre (Knighton)

I'd like to play music from a mobile phone, but my music centre no longer works.

The are at least two possible solutions, either stereo speakers (with built-in amplifier) that have a 3.5mm jack plug for music input, or a music centre that accepts 3.5mm or 1/4" jack plugs (I can use my existing speakers if they are compatible), or the ones that came with the music centre.