charging unit as per sanrok part .no. 2ed-254-3523 for automatic smoke/fire detection with alarm syste m for ac coaches confirming to rdso spec.no. rdso/2008/cg-04(rev-6) or latest. [ warranty period: 30 months after the date of delivery ] ,brake module as per sanrok part no. 2ed-254-4387 for automatic smoke/fire detection with alarm system for ac coaches as per rdso spec. no rdso/2008/cg-04.(rev-6) or latest. [ warranty period:30 months after the date of delivery ],green led for break indicatio