This robust double headed light is a 550V overhead trolley line indicator. The design and durability is ideal for the harsh conditions of the mining environment. It is used to warn people working underground of the high voltage line that is above. It is also used to indicate when the line is live. This ensures that the workers are cautious around the overhead line when the light is on. The illumination of bright red shines through both sides of the tunnel to promote safety and precaution in that area. The light also comes with High Voltage signage