GabbaGoods Flip View Case for Samsung Galaxy S4 with Replacable Back Cover, Sleep/Wake Function and Interactive Display - Blue Auto sleep/wake function. When opening the front flip the phone automatically wakes up. When closing the cover, the phone automatically goes into sleep mode Ability to answer/reject calls via the active window Window display shows time/date, battery usage, service signal, music, incoming calls, and messages Back Cover Replacement Reduce scratched and smudges on your screen