General phone cases have only fixed appearance.However, Phone case2.0 provides not only protection but also changeable pattern. It has an unique changeable structure,users can show their own style. We design this product for the high use percentage of mobile device today. People can make their smart phone more “smarter” now. Whenever people take the subway they need to take the transportation card for getting on. With this product,users can just take the phone case as e-money. Furthermore we design the flash drive into this product. At the same time we have some personal function for people like SIM card, mirror, and phone stand. People can choose four function for one phone case at same time. Of course these functions are all changeable on the phone case. Just remember to bring cell phone for meeting or discussion, and then throw away the traditional drive!