Pocket-Size and Easy to use,Mini Rechargeable Foldable Bluetooth Keyboard, Portable (Sync Up to 3 Devices), Ultra-Slim Travel Folding Keyboard for iPhone iPad Mac Android Windows iOS 2.4G Wireless and Bluetooth Keyboard:bluetooth 3.0+5.0 is better compatible with new and old devices,bluetooth mode:press and hold FN,then press 1,and then press and hold for 3 seconds,the blue light flashes,and bluetooth device 1 enters the seached state on the device side-open the system settings-turn on bluetooth -search and add. the portable folding keyboard supports connect up to 3 devices mode switching;support switching back and forth across devices ,connect 5.0 version to hibernate and wake up faster;with high frequency equipment switching,the keyboard works smoothly; Multi-System Compatible,this folding keyboard supports connect up to 3 devices,Its widely compatible with Windows, Android, iOS, Mac OS, perfect for laptops, desktops, Phones and more devices, the low-profile scissor keys give y