You're right to be interested! Those aren't just ordinary benches; they're a fascinating piece of smart city infrastructure. Often called "smart benches" or "solar benches," they integrate technology directly into public furniture. The most common feature is, as you noted, built-in USB charging ports, allowing people to recharge phones and tablets on the go. But many models go even further, offering wireless charging pads, free public WiFi hotspots, and environmental sensors that monitor air quality or noise levels.
Their power typically comes from integrated solar panels on the canopy or backrest, making them energy-independent and sustainable. Some connect to the grid for backup. The core idea is to enhance public spaces by addressing a modern need—constant device connectivity—while promoting outdoor activity and social interaction. You'll find them in parks, bus stops, university campuses, and downtown districts. They represent a shift towards more responsive and citizen-friendly urban design, turning passive seating into an active utility hub. Considerations include weather-resistant, tamper-proof designs and ongoing maintenance. It's a small but clever innovation making cities more livable and connected.