The Naztech ID Flip Cover is designed to protect your Samsung Galaxy S4 from scratches and dings, without adding bulk and while preserving the phone"s slim profile. The interactive transparent window allows the user to receive calls and view notifications without opening the case. The Naztech ID Flip Cover automatically turns the screen on or off by opening or closing the cover. This unique sleep-mode feature helps preserve battery life. Its innovative design replaces the battery cover to ensure ultimate slimness.