Kool(TM) Black Galaxy S4 S-View Book Cover 3500mAh Power Bank Charger Case Portable USB External Rechargeable Backup Battery with Auto Sleep/Wake Function & Viewing Stand For Samsung Galaxy S4 i9500 S-View Display Window shows incoming caller ID and number. Includes Magnetic Auto Sleep/Wake Sensor. High Battery Capacity Power Bank Charger Case for Samsung Galaxy S4 i9500 Works as both an external Phone battery charger and a protection case. Perfect cutouts allow access to all cameras, microphones, sensors, and controls On/Off switch with One-Touch Button; smart design easy to operate; Built-in kick stand for Video Watching