iPhone 4 or 4s (or iPod)- must be usable as an iPod at least (Broadwater BN14)

I have a nice set of speakers that an iPod can be sat in, but they only have the old big 30pin connector. I just want an old iPhone, or any ipod with a 30pin connector that I can plug into it and get them into use. Must be in the Broadwater BN14 area or Central Worthing as no transport.