To have an adequate amount of time to evacuate the premises in the event of an emergency, it is important to receive the earliest possible warning of danger. Designed for use as part of a two wire or four wire fire alarm system, conventional sounders and beacons provide audible and/or visual indication when the fire alarm system has been activated. Conventional sounders emit a high decibel output, whilst beacons are suitable for Disability Discrimination Act (DDA) compliant installations.