The Asus Zenfone Max Pro (M2) ZB631KL was announced in 2018, December With 6.26 inches, 97.8 cm2 (~82.0% screen-to-body ratio) IPS LCD, Powered by Qualcomm SDM660 Snapdragon 660 (14 nm) and running Android 8.1 (Oreo), upgradable to Android 9.0 (Pie), the device delivered smooth performance and multitasking capabilities. while the Li-Po 5000 mAh, non-removable ensured long-lasting usage.