... 55", 65" ,70" ,84" with IPTOUCH Software for Teaching and Meeting. Touch Digital Signal TV + Analogue + PC Interactive Touch LCD TV 55", 65" ,70" , ... 84" Touch Screen All-in-one integration for Teaching1 . IR Or Optical Technology ... PPT , Picture. 11. Insert video , audio. 12 .WIFI is optional interactive Touch LCD / LED TV for Teaching