Delta Faucet Co.’s Proximity Sensing Technology forms a 4" field around a faucet that senses a user’s hand and turns on the fixture; it turns off the fixture within two seconds after the hand is removed. Proximity has an auto shut-off feature (set to 45 seconds) and comes in battery or hardwire models. Its surface-mounted control box allows for easy maintenance and installation. The technology has been added to two of the company’s faucet styles: Arzo and Grail (shown), both of which are commercial grade and constructed of solid brass.