A sign in front of the machine promises 100% customer satisfaction: if buyers get a dead crab, the maker (a Chinese company based in Nanjing whose name I couldn’t decipher) promises they’ll get three crabs for free.
Each crab costs between $1.50 and $7.50, depending on the size. The machine’s producer says they currently sell around 100 crabs daily, resulting in about $500 sales.
The (Japanese) video embedded below shows how it works (the interesting part is between 0.25min and 2.15min):
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