Notice: This Android/Windows device is designed to function specifically with the current Android/Windows OS installed on it. Any alterations such as upgrades, modding with custom ROMs, rooting or flashing the Android device with other firmware will automatically void the device's warranty. Main Features: OUKITEL K10000 Android 5.1 4G LTE Phablet 5.5 inch HD IPS Screen MTK6735 64bit Quad Core 10000mAh Large Capacity Battery 2GB RAM 16GB ROM Bluetooth 4.0 13MP Camera Display: 5.5 inch 720x1280 IPS HD Screen CPU: MTK6735 64bit Quad Core 1.0GHz GPU: Mali-T720 System: Android 5.1 RAM + ROM: 2GB RAM + 16GB ROM Camera: Back camera 8.0MP (SW13.0MP) + front 2.0MP (SW5.0MP) Bluetooth: 4.0 GPS: GPS / A-GPS SIM Card: Dual SIM dual standby, One is Micro SIM card slot alone, another Micro card slot can also be used as a TF card slot. Note: 2 Micro SIM cards and TF card cannot be used together Network: 2G: GSM 850/900/1800/1900MHz 3G: WCDMA 1900/2100MHz 4G: FDD-LTE 800/1800/2100/2600MHz Unlocked for Worldwide use. Please ensure local area network is compatible. click here for Network Frequency of your country. Please check with your carrier/provider before purchasing this item.