BLU Energy X 2 - With 4000 mAh Super Battery - US GSM Unlocked Smartphone - Gold Unlocked Dual SIM smartphone, with Android 5.1 Lollipop 4,000 mAh super battery that lasts up to 3 days with standard usage and over 30 days on standby, get up to 1 hour of Talk time with lightening quick 10 min charge. 5.0" curved touch panel HD display, 8MP Main Camera + 5MP Front Camera with built in F2.2 Aperture + Blue glass MediaTek Quad Core 1.3 GHz Processor with Mali-400 GPU, 8GB Internal memory 1GB RAM Micro SD up to 64GB GSM Quad Band 4G HSPA+ (850/1700/1900): US Compatibility Nationwide on all GSM Networks including AT&T, T-Mobile, Cricket, MetroPCS, Straight Talk, Pure Talk USA and others