The I.C.Emergency usb
The In Case Emergency usb carries a text file which lists emergency contacts phone numbers, medical conditions, medications allergies etc. The usb will hold approx 200 pages of information (128mb) and you can add or delete any information on the file that you decide to. The usb is a robust, obvious and easily clips to your keys or if you ride a motorbike, or are disabled, the lanyard is the best way to carry it. You can add two people's details to the file like my wife and I do for when we swap cars. Just enter for example Driver#1 Male 57 and Driver #2 Female 53 etc.