The lights are powered by a tiny turbine that utilizes water rushing through the faucet, so no batteries are required. And for those who don't need a high-end satin-nickel faucet in their lives, there's always the screw-on Glow Flow faucet adapter, for around 20 bucks.
Dave has contributed to Dwell since its inception. He's a CalArts dropout, a former art critic for The New Yorker, and a producer of comedies on TV. He lives in, and writes from, Los Angeles.