Full-size folding wireless keyboard with a built-in trackpad and left/right click buttons. It has a rechargeable battery that provides up to 48 hours of continuous use (560 days on standby) and is compatible with Xiaomi Redmi 4a. Note: phone holder/stand is not included. Foldable tri-fold design offers extreme portability. Thin and foldable, it is ideal for travelers and business trips. Operate your mobile device anytime, anywhere, and write quickly, easily, and without errors. Also a good choice for editors. All Android, Windows, Mac, and iOS connection modes. Connect the keyboard to any Android, iOS, Mac or Windows device via wireless Bluetooth. Standby time up to 560 days and continuous use up to 48 hours. Wide universal compatibility. This folding keyboard uses Bluetooth 5.3 and is compatible with iOS, Windows, and Android. Note: desktop laptops without Bluetooth require a third-party Bluetooth adapter (not included) before use. Folded size: 5.98" x 3.82" x 0.71"