How does the CardNinja wallet work?
1. Take your smartphone (iPhone®, Android®, Windows®) or Blackberry®. Almost any one will do.
2. Peel off the backing of the CardNinja.
3. Stick the CardNinja onto the back of your phone or phone case. Just like a sticker.
4. Insert whatever credit cards, debit cards, licenses, IDs, or cash that you need.
5. Toss your old, bulky wallet.