Portable Foldable Bluetooth Keyboard , Foldable Bluetooth Keyboard Aircraft-grade Aluminum Alloy Ultraslim Mini Wirless Keyboard for iPhone iOS, iPad, Android, Windows, other Smartphones, Tablets Foldable design, perfect portable bluetooth keyboard with pocket size Made of imported excellent aluminium material for superior rigidity. X scissor-switch structure for the keycap brings you pleasing typing experience. Compatible with 3 major operating system: iOS / Windows/ Android. Supports most bluetooth-enabled devices. Built-in 210mAh rechargeable Li-polymer battery, works for up to 80 hours of effective usage time. Magnetic switch with smart auto sleep / wake feature. Press Fn+C, fast access to bluetooth pairing state. American broadcom bluetooth 3.0 chip for high speed connection and signal distance up to 33ft(10m).