supply of supply of calling-on aspect led signals (subsidiary signal), 110v ac retrofittable in existing cls housing and compatible with ac led ecr as per rdso specn. no. rdso/spn/153/2011 (rev.4.1) or latest.signal aspect led signal unit, 110v ac with health monitor alarm unit having lamp proving output to drive led lamp proving relay, the complete unit conforming to rdso specification no. rdso/spn/153/2011 revision 4.1 or with latest amendment or to the latest specification of led signal aspects and technical specifications.supply of calling-on aspect led signals (subsidiary signal), 110v ac retrofittable in existing cls housing and compatible with ac led ecr as per rdso specn. no. rdso/spn/153/2011 (rev.4.1) or latest.signal aspect led signal unit, 110v ac with health monitor alarm unit having lamp proving output to drive led lamp proving relay, the complete unit conforming to rdso specification no. rdso/spn/153/2011 revision 4.1 or with latest amendment or to the latest specification of led signal aspects and technical specifications.,supply of calling-on aspect led signals (subsidiary signal), 110v ac retrofittable in existi ng cls housing and compatible with ac led ecr as per rdso specn. no. rdso/spn/153/2011 (rev.4.1) or latest.signal aspect led signal unit, 110v ac with health monitor alarm unit having lamp proving output to drive led lamp proving relay, the complete unit conforming to rdso specification no. rdso/spn/153/201 1 revision 4.1 or with latest amendment or to the latest specification of led signal aspects and technical specifications. [ warranty period: 30 months after the date of delivery ] ]