Asus Zenfone 2 ZE551ML official Pictures. Asus Zenfone 2 ZE551ML is a Smartphone of asus. The Asus Zenfone 2 ZE551ML Android Smartphone. Announced Jan 2015. Features 5.5″ Display, Intel Atom Z3580 Chipset, 13 MP Primary Camera, 5 MP Front Camera, 3000 MAh Battery, 64 GB Storage, 4 GB RAM, Corning Gorilla Glass 3. Asus Zenfone 2 ZE551ML price starts.