eSynic Foldable Bluetooth Keyboard Pocket Size Tri-Folding Wireless Keyboard Ultra Slime Folding Keyboard Rechargeable Lithium Battery Aluminum Alloy Housing for iOS/Android/Windows FOLDABLE DESIGN & POCKET SIZEExtremely Thin and Foldable Keyboard can be a Perfect Gift for Anyone who often Travel or on a Business Trip. (Closed size: 5.8" x 3.6" x 0.7", Open Size: 9.9" x 3.5" x 0.2") IOS, WINDOWS & ANDROID COMPATIBILITYAfter Connecting with the Device, You can Switch Between the Three Systems Freely by Press Fn+relative OS Key(Q for Android, W for Windows, E for iOS)to Select Operating System. AIRCRAFT-GRADE ALUMINUM HOUSINGMade of Aircraft-grade Aluminum Alloy Texture for Superior Durability, It is very Durable and has the Ability to Resist Bumps. ON/ OFF Switch Connection Established Immediately. RECHARGEABLE LITHIUM BATTERYBuilt-in 210mAh Lithium Battery, Provides more than 60 hours of Effective Usage time, on a Single Charge. Comes with 18-Month Warranty! MAGNETIC SWITCH DESIGNBluetooth Connectivity will Automatically Turn ON when you Open it, Automatically Turn OFF when you Fold it. Smart Auto Sleep and Wake Feature.