I've been digging graves. I'm telling you, a jewelry machine is a machine with rows of motors in it. Each motor has a spring, which is used to hang all kinds of jewelry, corresponding to each number. After pressing the button, the motor will rotate for a certain period of time and the corresponding jewelry will come out. The machining sound is generated by the vibration of the micro motor. Before jewelry came out, it was just a lie. Don't be cheated again. The cost is very low. The copper coins, coins, silver coins and mobile phone versions you threw in were hacked.