supply of signal exchange light - flashing ledsignal exchange light - flashing led,signal exchange light - flashing led lamp (green and red) at outside of the drivers cab for exchange of signal between driver/guard and the station master during train operation, it shall be c onforming to rdso specification no. elrs/spec/pr/0022 latest, visibility at 2km in day and night, freq uency of flashing 55-65 per minute, ip66 protection. the overall general management shall be followed as per icf drg.no.889-7-2-007 latest stand suitable to vb rakes as per rdso specification no. rdso/pe /spec/emu/0196-2019. [ warranty period: 30 months after the date of delivery ] ]