This EcoPower faucet by Toto is the type of faucet that uses a infrared sensor to turn on automatically. What makes this faucet unique is that it harnesses the electrical power generated by its own water flow. It has a miniature turbine generator to maintain its rechargeable battery. It can keep itself charged on as little as 5 uses a day. The faucets use less than 0.25 gallons per cycle.

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I would like this myself, but it is not practical in the home unless everyone in the house wants the same temperature/pressure.