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... ed that he was dressed in casual clothes. He only had a special electronic wristband on his wrist to confirm his identity as an employee.
On one hand, this wristband could prove his identity. On the other hand, it could also show the serial number for the specific location of the call.
When customers prompted for help, the wristbands of all sales in a small area would vibrate with a light reminder. After one of the salespeople pressed the reception button on the wristband ...
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