Two designers have placed free solar-powered phone chargers on top of the umbrellas at Pearl Street Plaza. They say the chargers are the only ones of its kind in Brooklyn.The chargers cost about $800 to build. Even without the sun, the tables can charge phones for up to 15 hours.

Right now, the chargers are prototypes, but the Dumbo Business Improvement District says it has received positive feedback and could add a few more in a couple of years.