The ZenFone Max Pro M1 was a sleeper hit for ASUS. The ZenFone Max Pro M2 aims to build on that success. The new phone brings with it a more modern design, faster processor and improved cameras while maintaining things like the stock Android UI and massive battery that made the original so popular.
Source: https://www.gsmarena.com/asus_zenfone_max_pro_m2-review-1873.php