I wanted to add extra floats since I don't trust them over time. We lost a key once and three of us searched for 1/2 hour so I suspect it sank in the river. I found a site called CHUM and ordered something they had for boat keys that looks like it will work out. These should be like $1 and not 4 or 5. Maybe Ollies will also have something. I just bought extra keys and had them all programmed for all my MPEMs but don't trust these new floats either. I never lost a key but friends don't always follow my instructions to secure it to the jacket.