The first truly stand-alone siren Bono combines the possibilities of sophisticated electronic sirens with compact dimensions, and a battery backup. It can be used both in the exterior and interior, industrial areas and noisy production halls, open-pit mines, and in a variety of other areas. Bono can reproduce alert tones and voice messages from its internal memory, broadcast live from an external microphone as well as transmit audio signals from other external sources. The electronics of the siren including a battery and 100W pressure loudspeaker is embedded in a resistant box made of aluminium and stainless steel, while maintaining the low weight and minimum dimensions of the siren. A wide range of optional accessories is offered to communicate with, control, or to power the Bono siren using a solar panel. As standard, Bono is supplied with a big horn in the 100B version; however, upon request, it can also be supplied with a small horn in the 100S version.