The Angel Faucet is specifically meant for those people who have lost an arm. Apparently stats show that folks with this kind of impairment find it difficult towash their hand properly. The sensor-activated tap is integrated with a scrubbing pad that allows you to scrub and clean the single hand effectively.
The pad is made with soft silicon, and can be removed for cleaning. The flow of water through the tap stops when the user moves their hand away from the faucet outlet to the scrubbing pad.