CAT S40 16GB Unlocked GSM 4G LTE Refined/Rugged + IP68 Certified Quad-Core Smartphone w/ 8MP Camera - Black 2G: GSM 850 / 900 / 1800 / 1900, 3G: HSDPA 850 / 1700(AWS) / 1900, 4G: LTE 700, 850, 1700, 1900, 2100, 2600 (Bands: 2, 4, 5, 7, 12, 17) IP68 certified & MIL-STD-810G certified; dust and water proof, Drop-to-concrete resistance up to 1.8 meter Android v5.1 (Lollipop), Quad-Core 1.1 GHz Cortex-A7 Processor, Chipset: Qualcomm MSM899 Snapdragon 21, Adreno 304 Graphics 8 Megapixel Camera (3264 x 2448 pixels) w/ Autofocus + Front-Facing 2 Megapixel Camera Internal Memory: 16GB, 1GB RAM + microSD Slot Expandable up to 64GB