The HFI-EBSB-23R-06 is an aesthetically pleasing low profile 32 tone audio/visual base sounder with combined red visual indicator, suitable for all devices in the Altair range of intelligent detectors. It offers class-leading acoustic and EN54-23 compliant visual performances with extremely low current consumption. When used in conjunction with an associated intelligent detector the unit can be controlled via the cause and effect programming of a compatible control panel utilising the Hyfire digital protocol. The unit has integral DIP switches allowing the independent adjustment of both sounder Volume and Tone settings.