Provides audible and visual indication of 800 Series Alarm calls outside bedrooms, WCs and any other area fitted with an 800 Series calling device.Indicates Standard calls via a constant tone/constant red light and Emergency calls via a pulsing tone/pulsing red light. · · · Dual red LEDs and triangular diffuser make it highly visible from a distance. · · Mounts on a standard UK 25mm single gang flush or surface back box. · · Can also be used as an area indicator at corridor junctions, staff workstations, etc. · · Finished in tough, durable ABS plastic.