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Due to the COVID-19, people have to scan the code or register when entering public places .However, mobile phone scanning can easily cause people to gather in a short time and increasing the risk of infection. In order to keep a great social distance, use the smart band instead of the mobile phone. Just like the card swiping on the bus, people fill their information into the smart band and swipe it when entering the shopping mall. When the distance between two people is less than 1 meter (the safe distance) , the smart band will send out a vibration warning through the function of measuring distance to remind people to keep a safe distance.