Bluetooth Power classes-class1,class2,class3

Bluetooth defines three main power classes used by the devices. Power control is used to keep the radiation within the limit so that system works efficiently without interfering with the neighbour bluetooth devices. The power control algorithm is designed between master and slave devices using link management protocol. The following table mentions distance coverage for each of the power classes.

Power class type Power limit Distance coverage
Bluetooth power Class1 Output power of 100mW( 20 dBm) to achieve maximum range. Minimum power is 1mW.
Power control is mandatory to have in this bluetooth power class.
100 meter
Bluetooth power Class2 Max. output power 2.4mW(+4dBm)
Min. output power 0.25mW(-6dBm), Power control is optional in this bluetooth power class.
10 meter
Bluetooth power Class3 Lowest output power is possible with this power class, nominal is 1mW. 1 meter

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