Item a complete waste of money.  Have no idea if it actually blocks someone from reading your data because of problems with item.  The problem is that it sets off the alarms when you go through checkpoints.  Had to take everything out of my pockets before I realized that it was the passport holder that was triggering the Customs alarms.  I had to take my passport out of the holder in order to get through Customs.  Thus making the item useless