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We use Bluetooth to transmit messages and content between the Base station(AP )and labels, Bluetooth means Low Energy. The main feature is low power consumption, conservatively to say, the batteries can supply power at least 3 years continually. The controlling radius of one Access Point > 50m (open environment).Bluetooth label can be used as a locating beacon. Users can develop some applications based on it, for example, commodities searching, self-positioning, for games and so on.. Access Points are backup each other based on this working mode. So that it will not affect the whole system once an Access Point has some problems. All communication data is checked for integrity and security.