1.Three Monitor display 2.With touch screen 3.Safety approvel:CE.ROHS,FCC 4. ... material; side aluminium alloy material ; back Cold-rolled steel materialSpeakerstero with electromagnetic resistance ; excellent effectPower voltageAC220V +-10% 50HZ+- 1HZNetwok port ... BMP, PPT, WORD, EXCEL, TXT, MP3, RMVB, SWF etc5. Scrolling texts in English and Chinese version are available, various display modes ...