The USB flash drive used in square dance is the same as the ordinary USB flash drive. You can buy an ordinary USB flash drive directly and download the music for the square dance.
The name of USB flash drive comes from a new storage device produced by Netac, called USB flash drive, which is connected through USB interface. After that, the equipment with similar technology can no longer be called "USB flash drive" because Netac has registered a patent, but it is renamed as "USB flash drive" or "USB flash drive" figuratively.