Part – Transformer for P# 105083 & 105086 w/ Light and Audio Alarm Ballast 55W Part – Transformers for P# 105083 & 105086 w/ Light and Audio Alarm Ballast.This item includes the transformer only. The transformer could be a compatible one or may not be the same your original one you have in your UV system.Operation Indicator: Green Light = Working. Red Light = Not Working.The alarm will sound when the UV Lamp(s) needs to be changed or if any issues are present.