The unit consists of an Enclosure with the word REFUGE BAY engraved on an Opaque Perspex.
In the case of an emergency, the remote emergency switch which can be situated in the Refuge Bay can be activated, lighting up the Refuge Bay Light, this will also activate the siren and beacon flashing light.
In the event of a power failure, the units automatically lights up with a siren and flashing lights. 
The unit will visually and audibly indicate the position of the Refuge Bay to any rescuers.
The unit is fitted with a battery backup of up to 10 hours in the event of a power failure.