The Asus Zenfone Max Pro (M1) ZB601KL/ZB602K was announced in 2018, April With 5.99 inches, 92.1 cm2 (~76.2% screen-to-body ratio) IPS LCD, Powered by Qualcomm SDM636 Snapdragon 636 (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.