This is the ZenFone Max Pro M1, an inexpensive mid-range phone that promises a two-day battery life on a single charge and is equipped with a 5,000 mAh battery. Neither the rest of the specifications are bad, providing just what is needed for a quality user experience. Last but not least, the ZenFone Max Pro M1 has pre-installed Android 8.1 Oreo, in a clean, non-customizable interface and without many proprietary applications.