supply of supply of power supply unit(2 s), centralized power supply system 24 v /12v dc power pack, supply of mains power pack with output. , supply of power supply unit(2 amps) as per rdsos specno- irs-tc-72/97 amd. 1 with latest amendment with 12 v/ 7 ah m.f. battery. [ warranty period: 30 months after the date of delivery ] ] , centralized power supply system 24 v /12v dc power pack with 7 ah mf battery for electron ic gate telephone system.as per spec no. rdso/spn/tc/51/2021-rev-1. make brand - epsilon or similar ( warranty period : up to 30 months from the date of delivery.) [ warranty period: 30 months after the dat e of delivery ] ] , supply of mains power pack with output of 3.6 v dc, 2.2ah capacity li ion battery with facilit y to charge from 230v ac mains suitable for magneto phone.(low noise, stable regulated output and solar c harging features). [ warranty period: 30 months after the date of delivery ] ]