Operating system: iOS 11.0 or later, Android 6.0 or above. Network: Wi-Fi, 4G or 5G required. Interface: Traditional Chinese or English **Please note the operation systems listed below are not official Android Systems, which may have compatibility issues with RTHK SCREEN and the app's functionality cannot be guaranteed: Huawei / Vivo / Xiaomi / MIUI / Meizu / OnePlus / Flyme / Aliyun / OMS ...