1.[FULL SIZE FOLDING WIRELESS KEYBOARD & MOUSE TOUCHPAD] : You can have full control to be compatible with Xiaomi Mi 4. It has a Built-In Rechargeable Battery that can be used for 48 hours (560 days standby) and comes with a mouse touchpad plus left and right click buttons. It is very convenient and portable with a mini size for user-friendly interaction. (PHONE HOLDER/STAND NOT INCLUDED) 2.[FOLDABLE TRI-FOLD DESIGN] : Our FULL SIZE Travel Keyboard is extremely thin and foldable. It's a perfect gift for those who often travel or are on a business trip. It allows you to operate mobile devices on the go, write fast, easily, and error-. It's also a good choice for editors 3.[ALL ANDROID PC MAC IOS CONNECTION MODES]: You can connect the keyboard with your device via Wireless Bluetooth to ANY Android, IOS, Mac or Windows Device. It has a long-lasting 560 days of standby time and up to 48h of continuous use, making it suitable for all your needs. 4.[WIDE & UNIVERSAL COMPATIBILITY]: With Bluetooth 5.3 technology, the foldable keyboard can work with 3 major operating systems: iOS / Windows/ Android. NOTE: [For Desktop PC Laptop without bluetooth function, you need to use third-party bluetooth adapter (not included) before use]. Folding size: 5.98' x3.82' x0.71'