ZTE Compel Z830 4G Black Unlocked AT&T Version GSM Android Smartphone WiFi - No Warranty GSM/GPRS/EDGE 850/1900 MHz, 3G - UMTS 850/900/1900/21000 MHz, 4G-LTE Band 4 and 17 DISPLAY-4.0 inches Battery-Talk: 4.5 hours max.(270 minutes) Standby: 360 hours max.(15 days) 1820 mAh LiIon, Removable Processor 1.2 GHz quad-core Memory-4 GB internal storage, raw hardware 1.2 GB internal storage, available to user 1 GB RAM