SwitchEasy SW-126511 Durable Case with Card Holder for iPhone 4/4S - 1 Pack - Retail Packaging - Black Card holding mechanism provides easy storage for single smartcard or debit card. (54mm x 85mm x 0.8mm) Supports direct debit on all contact based smartcards and debit cards Made from scratch-resistant polycarbonate and sandblast finish design for best grip experience Auto lock function and slide button for easy ejection of the smartcards and debit cards Designed for your iPhone 4/4S