: The primary appeal is the novelty duck shape. It is extremely lightweight (approx. 60g) and small (47x37x40mm), making it more of a conversation piece than a high-end audio device.
This response uses data provided by Google's Knowledge Graph Hampenberg Duck Toy Mp3
While there isn't a widely recognized official product under the specific brand " Hampenberg Duck Toy Mp3 : The primary appeal is the novelty duck shape