Electronic sirens of big acoustic output are used for large area warning (giant voice). The Maestro sirens have 375W amplifiers, power backup, can reproduce voice from microphone input and from siren memory and have aluminium alloy horns.
The Maestro sirens have enhanced control and self-test abilities in comparance to the more simple eRotor. In addition, the Maestro sirens have CAN bus which allows the connection of more sirens together using a wire link. Siren cabinet also has a different construction, hiding the electronic components behind a door. The siren control is also possible via GSM phone.