For small to medium sized business, a simple credit card terminal will best meet your needs. When you have a large inventory and want to keep track of it through your POS system, then you will want to consider all the "bells & whistles."
Typi non habent claritatem insitam; est usus legentis in iis qui facit eorum claritatem nvestigationes demonstraverunt lectores legere me lius quod ii legunt saepius.