https://blog.faceutil.com/2017/04/05/flash-alerts-pro-%ed%94%8c%eb%9e%98%ec%8b%9c-%ec%95%8c%eb%9f%ac%ec%b8%a0-%ed%94%84%eb%a1%9c-v1-1-4-%ed%86%b5%ed%99%94-%ec%95%8c%eb%a6%ac%eb%af%b8-%e2%85%a3/