ASUS Zenfone 2 ZE551ML 4G LTE 4GBRAM 64GBROM 5.5 inch Android OS 5.0 Unlocked Smart Phone, Intel Atom Z3580 Quad Core 2.3GHz, WCDMA , GSM , LTE, Support Bluetooth, WiFi, GPS, A-GPS (Red) Intel Atom Quad-core processor at 2.3GHz 4GB RAM and 64GB internal storage 5.5 inch TFT IPS capacitive screen 1920x1080P Front 5.0MP + Back 13.0MP Camera Android 5.0 operating system