Supply of industrial grade operator VISUAL DISPLAY UNIT ( VDU ) of sizes 55 ' ' Full HD, HDMI/ DVI connectivity, in built speaker with additional DP cable of 5m length- 1 no, etc with suitable accessories for control terminal/ maintenance terminal & compatible to Electronic Interlocking ( EI ) as per RDSO specification: RDSP/ SPN/ 192/ 2019 ver 2. 0 or latest and as per detailed technical specification enclosed.