... 3:3G wifi 4: USB,TF,HDMI Specification of M13 mid tablet PCModel M13picture sizeL19.0*W12.0*1.0mm ,mtal, light ... BMP, PNG3D e-bookTXT, EPUB, PDF,WORD,EXCEL, POWERPOINTSbattery typeLipolymer battery 3.7V 3200mA/h life of batteryWifi about 4hrs,3G ... otherscolor/certificationcertificationFCC CE ROHScolor/certificationfront:black,rear:silver 7 inch mid tablet PC multi-touch capacitive screen with 8G flash