So this is a universal Handstarp Wallet. it sticks to the back of almost any case,phone, or tablet and acts as a Wallet and a Handstrap.

Its by a company named MiniSuit and its like 2 Dollars on amazon : MiniSuit Tactic - The Universal Handstrap Wallet (Black): Cell Phones & Accessories

Here's a video review :

This is grate if your someone who likes to have there credit cards and what not attached to the back of there phone.