ZTE OPEN C Dual Core Android 4.4 KitKat 3G Unlocked Smartphone 4GB ROM 512MB RAM+Excelvan&reg; 8GB Micro SD TF Memory Card Android 4.4 KitKat OS with 1.2GHz Qualcomm Snapdragon 200 MSM8210, Dual core processor and 512MB RAM + 4GB ROM Android 4.4 KitKat compatible, can be switched by updating the ROM. The Excelvan micro SD card include the Android 4.4 KitKat/Firefox OS 1.3 firmware update pack for ZTE Open C Smartphone. 4.0 inch large TFT capacitive screen with 800 x 480 pixels WVGA screen resolution; 2.0MP rear camera, up to 1600x1200 pixels resolution Support 2G network: GSM 850/900/1800/1900MHz; Support 3G network: WCDMA 850/1900MHz NOTE: The system from factory default is Firefox OS. If you are not accustomed to using Firefox OS, please contact us and we will provide you the Android OS firmware.