Foxnovo Ultra-thin Slide-out Wireless Bluetooth Keyboard Protective Hard Back Case Cover with Backlight for 4.7-inch iPhone 6 (Black) Bluetooth version: Bluetooth V3.0. Battery type: built-in rechargeable Li-ion battery. Charging time: at least 2 hours (at least 6 hours for the first time use). Fully compatible with 4.7-inch iPhone 6 smartphone. Integrated slide-out Bluetooth keyboard allows you to switch from the touch screen to a physical keyboard as desired. Also can act as a back case to well protect iPhone 6 from dust, scratch and other damages.