Naztech 12556 Sliding Bluetooth Keyboard Case for Samsung Galaxy S4 - Retail Packaging - Black Adjustable Stand Function Conveniently Adjust from 0 - 90 degree, Detachable Hard Shell Case, Tilts upright Backlit Keyboard, Specialized keys (Home, Search, Play/Pause Buttons) to enhance User-friendliness Charging Time: 2 hours, Working Time: 8 hours, Standby time: 45 days, Transmit Range: 3 meters Package Contents: Bluetooth Slideout Keyboard, Micro USB Charging Cable, User Manual Bluetooth Version: v3.0, Operating Voltage: 3.7v, Battery Capacity: Lithium 280mAh Adjustable Stand Function Conveniently Adjust from 0 - 90 degree, Detachable Hard Shell Case, Tilts upright^Backlit Keyboard, Specialized keys (Home, Search, Play/Pause Buttons) to enhance User-friendliness^Charging Time: 2 hours, Working Time: 8 hours, Standby time: 45 days, Transmit Range: 3 meters^Package Contents: Bluetooth Slideout Keyboard, Micro USB Charging Cable, User Manual^Bluetooth Version: v3.0, Operating Voltage: 3.7v, Battery Capacity: Lithium 280mAh