What kind of Medic alert do you use?

So recently I have learned I need to wear a medic alert item. My concern with a medical alert bracelet is infection control. So I was considering a medical necklace. Where do you wear your medical alert?
I wear a stainless bracelet and make sure I include it when washing my hands.

road ID has some great ones! http://www.roadid.com/Common/Default.aspxincluding some that can be worn on the ankle