Supply Of Electronic Lc Gate Telephone System With Voice Logger Facility As Per Rdso Spec No Rdso/Spn/Tc/51/2011 (Rev 3.0) Or Latest Consist Of One Master Telephone, 06 Slave Telephone With Modifie D Surge Protection & Line Connecting Unit And 24 Volt Dc Power Supply Unit With Mf Battery Compatible With Existing Electronic Lc Gate Telephone System Of Ddu Division. Make: Bentron Power System Or Similar Or Be Tter [ Warranty Period: 30 Months After The Date Of Delivery ] ]