A secret box, there is message may be a lover’s confession or a father’s sentimental message to his son.

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It is a recording device with "cryptex" structure. Turn the disc on the device to enter the password. When the password is entered correctly, device will light up and pop up the recording interface.

A pre-recorded message will be broadcast. It is possible to change the password and update the content of the recording message by the designed gear structure.The password may be a random scribble from childhood, or a memory of a mountain ridge profile.