The wall sounder-strobe is used if in addition to the sounder tone, optical alarming according to EN 54-23 is required. The sounder has 32 different tones, of which the following four tones have been tested according to EN 54-3: • Alternating tone 800Hz/1000Hz, • Continuous tone 970Hz, • Slow Whoop tone NEN 2575, • DIN 33404 tone. The tone is selected via DIL switches. If the sounder is actuated via 2 control panel outputs, it can also be operated with an alternative tone. In this way, multi-stage alarming with 2 different tones can be implemented. The sound level is adjusted in 4 steps, by means of DIL switches. Thanks to the use of light emitting diodes, the strobe with clear cap and white light has a low power consumption. The strobe has been tested according to EN 54-23 Class W (wall). Due to the optimised design of the lens, very high illumination of the room is achieved.