Bluetooth is a short-range technology aimed at simplifying communications and synchronization among network devices. Bluetooth is divided into three classes:
Class I has a maximum transmission range of 100 meters. Max data transfer rate of 721 Kbps.
Class II (most common) has a maximum range of 10 meters. Max data transfer rate of 2.1 Mbps.
Class III is a short range and hardly used at a maximum range of 1 meter.
**Source by wikipedia **
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