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The device is set outside the public toilet, which is convenient for tourists to take suitcases into the toilet when they go to the toilet. Because it is inconvenient to take suitcases into the toilet for testing, and they are worried about being taken away when they are put outside, the device can facilitate users to lock the suitcases outside, and make users more convenient to go to the toilet. At the same time, it also has the functions of remote control of mobile phone, fingerprint unlocking, intelligent control and convenient use.