The Franke air activated control switch button operates continuous feed waste disposal units from a point determined by the consumer, eg on the worktop or possibly even within the sink perimeter.
Air switches are safer than electric switches because they keep the electricity away from the users' hands. The air switch control mechanism usually mounts under the sink (or is incorporated into the Waste Disposal Unit itself), where it remains dry. From the activated control switch button, an air tube connects with the switch controller, which in turn operates the unit.
The benefit is that the operational switch avoids the necessity to have a wall mounted toggle switch (which itself is electrical), and is therefore neater and safer to operate.