... Product Description COOL5700WIFI Multi-media functionsOS MTK Main functions Dual sim dual standby,Dual camera,Analog TV,FM,Quadband,Wifi Built-in games ... functionsMemory 23.4MB built-in,support 4 GB TF card Expansion Java,Bluetooth files transmission,Bluetooth earphone(voice) ... ,MMS,Storage expansion,E-book,Incoming call firewall,Dual sim dual standby dual Bluetooth,Stock online,IP call,Calendar,To-do ...