These cards are a good idea. I make my own. They can be easily laminated with packing tape. I even make a pull tab so I can easily pull it from my wallet. Some people I know put the card so it hinges off their driver's license.

I find it is best to have multiple copies so you can hand the card to the person who needs to read it. I do this at TSA at the airport. With no need to take it back, there is a better chance they will read it all and refer back to it.

Mine says:

Please be patient with me. I suffer from a
brain injury that causes me to over-react
when confronted with shouting or someone
barking orders. I respond by getting loud.
Any assistance to help limit excessive
auditory stimulation is helpful.

I can easily print this in 12 pt type on a piece of paper that is smaller than a credit card.

I also have my ICE information on my cell phone. Emergency personnel know to check cell phones for ICE ( In Case of Emergency) information. Start the name as ICE plus 'wife Susan' or 'mother Diana, mil Debbie, ' ect. Emergency personnel know to check this right away.

This issue is an important one. One TBI survivor I know uses an iPhone/iPad app that will speak for him when he is under stress and struggling with word finding. It states the issue based on an icon he selects.