GPS: built-in, 1.3 HDMI output, SD, TF card reader slot, 3G: Built in 3G , 3G phone optional OS: Android2.2 Main functions:1,screen size: ' 800x480 WVGA resolution2,Capacitive touch panel3,Andriod 2.2 software system4,TCC8803 telechips cortex a8 CPU type, 1.2 GHZ core - 45 nanometer5,Openvg 1.1 / opengl graphics processor ES 1.1 &2.0 2000 million polygons @ 320 Hertz6,512MB DDR3 ram capacity7, ...