The thumb drives worked out great as soon as the conference registrants figured out how to open them. This is the first year we have used a credit card thumb drive. It was pretty funny because in our hotel we had to put a card in the wall of the hotel rooms to keep the electricity on in the room (it was a go green hotel). So, people thought that the thumb drive was in there to keep the lights on! Anyway, after I demonstrated to them how to open it they all got a good chuckle. Thanks and I'll be calling you again for our next order!