It's like a dog I.D. tag in that you can write whatever you like. I just have my name, emergency contact and the fact that I have a cervical fusion. I've heard cops say that it is preferable to keeping something in your bike bag because some cops would not think to look in there. When it's on your person, it's hard to miss. I have the ankle ID and I never even know it's there except for the weird tan line in the summer.