GK608 Ultra-thin Foldable Bluetooth V3.0 Keyboard, Built-in Holder, Support Android / iOS / Windows System, GK608 (Black), GK608 (Grey), GK608 (Gold)1. Bluetooth 3. 0 wireless connection, for Windows, iOS, Android three systems to meet different equipment needs 2. Scissors and feet buttons, first class feel and high durability 3. Built in stand for tablet or mobile phone, freeing hands 4. Built in lithium battery, can be used for 80 hours after full charge, automatic sleep function, energy saving design Specification: Keyboard Types Wireless Keyboard Material ABS, Aluminum Alloy Working Time 80