The APart E-VOL40 is a 100Volt volume control that can handle up to 40 Watt of power. It is very versatile thanks to the step-by-step attenuation in 11 steps + zero position. The E-VOL 40 is designed to handle 24V priority signals. This means that can always get an announcement out, even to zones where the local volume control is in the OFF position. If amplifier has 24V priority output, it will send a 24 V signal when push the talk button on the microphone. The 24 V signal will close a relay on the E-VOL40 volume control and the signal will pass, even when the volume control is in the OFF position. This can be very useful for emergency or evacuation messages. The E-VOL40 is built on a universal chassis that easily can be integrated with Gira, Jung and Euro.