Electronic sirens of the MAESTRO series are developed for the needs of the civil defense and sound coverage of large city localities, public areas, stadiums and large-scale industrial zones. The MAESTRO sirens are known for very good sound qualities, coming as high-performance warnings units. The sirens have the ability to be activated in a number of ways, such as by the BMIS radio modules, FM radio, GSM (Global System for Mobile Communications standard module [activation by cell phone]) or SSRN (Systém Selektivního Rádiového Návěštění, selective radio signaling system).The siren head is among other things constructed in a way to resist aggressive weather conditions or temperatures and thus making it durable. It can last for the minimum of 10 years.

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Although the MAESTRO devices can be assembled in multiple performance variants, the most commonly used are the 750W and 1500W variants. Custom variants may be made, such as the 4000W variant with a total of 32 horns, though this is relatively very rare. ESp MAESTRO series also come in the PREMIUM variant, which differs from the original MAESTRO variant in the contents inside the control box.

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The ESp series (namely SiBT) are a product of German manufacturer SiRcom GmbH. However, the MAESTRO and PREMIUM subseries are assembled by the Czech company Technologie 2000, made specifically in order to comply with the technical requirements in Czechia, whilst still wearing the SiRcom labels.