China’s noisy ‘dancing grannies’ silenced by device that disables speakers
This sounds like a bad device. The fact that people will use the squares and parks for large activities like this is a really good part of Chinese culture. You bring together community, you get exercise, etc. That's a great thing. US really underutilizes public spaces and many things become a financial transaction. This is just one of the many reasons why Chinese cities are almost universally better than American cities (more walkable, better transit, easy navigation, more public spaces. Though they do love their super blocks).