OnePlus X Unlocked Smartphone, 16GB Black (US Version) Best-in class camera sensors (13MP primary rear camera with f/2.2 Aperture and Phase Detection AF (ISOCELL technology) along with 8MP front facing camera with f/2.4 Aperture) Crafted to perfection with premium stainless steel frame and a super-vibrant AMOLED 5 inches (12.7 centimeters) Gorilla Glass 3 Display Screen (Full HD @ 441 PPI) OxygenOS based on Android Lollipop 5.1.1 with Qualcomm Snapdragon 801 (2.3 GHz Quad-core SoC) featuring 4G LTE, 3GB LPDDR3 RAM; 16GB eMMC v5.0 storage (expandable storage up to 128GB) Long lasting 2,525 mAh LiPo battery; Ports (2 slots - fits either 2 Nano SIM cards (4G+4G) (DSDS) or 1 Nano SIM and 1 microSD card) and a 3-way Notification Alert Slider 1 year manufacturer warranty for device and battery, 6 months manufacturer warranty for in-box accessories including charger from the date of purchase