An automatic faucet or tap (also hands-free faucet, touchless faucet, electronic faucet, motion sensing faucet, sensor faucet, or infrared faucet) is a faucet equipped with a proximity sensor and mechanism that opens its valve to allow water to flow in response to the presence of a hand or hands in close proximity. The faucet closes its valve again after a few seconds or when it no longer detects the presence of hands. Most automatic faucets are battery powered and incorporate an active infrared sensor to detect hand motion.
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