The contactless flush sensor kit is compatible with all pneumatic concealed cisterns from Tavistock. It provides a touchless flush, with just a wave of a hand. The Sensor works using capacitive sensor technology to detect a change in the electromagnetic field. When the user waves their hand in front of the sensor it will initiate the flush. A short wave activates the reduced flush of the cistern, whilst holding your hand up slightly longer triggers a full flush. The sensor can be mounted behind a back to wall WC unit fascia or under a worktop or tiled wall where the cistern is located. A discreet black decal is included to stick on the front of the fascia or tiled surface to indicate sensor location if desired.