We use medic-alert. I like their service and knowing that an emergency responder can call the 800 number and get all his medical info and our contact details. He started with the necklet, because he didn't want a bracelet. After losing the second necklet, though, we went to a bracelet. It stays on him all the time. I just got my younger son a medic-alert bracelet, after discovering a nut allergy. The clasp on it was loose and it kept falling off, but a quick call to medic-alert and they sent me a postage paid envelope to send it back to be repaired. Medic-alert's customer service is great. They usually have special deals for kids, so call their 800 number and ask.