supply of 24 v power supply unit with mf battery and charger for lc gate telephone as per rdso spec no.: rdso / spn / tc / 51 / 2021, rev.-1 ) . this includes testing and commissioning, all installation related material to be supplied by the firm as per site requirements. [ warranty period: 36 months after the date of delivery ] , slave telephone for electronic lc gate communication system as per rdso spec no.:: rdso / spn / tc / 51 / 2021, rev.-1 this includes installation, testing & commissioning of the system. [ warranty period: 36 months after the date of delivery ] , supply of master telephone of electronic lc gate communication system as per rdso spec-: rdso / spn / tc / 51 / 2021, rev.-1 ) or latest with voice recording facility with latest amendment compatible with lc gate communication system.this includes installation, testing & commissioning of the system. [ warranty period: 36 months after the date of delivery ] => limited