Over what distance will a Class 1 device communicate with a Class 2 device?

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Communication between 2 devices is governed by the capability of the lower power device. The maximum output power and expected range of each Bluetooth class range can be found in the table below:

ClassMaximum Output PowerTheoretical Range
1100mW / 20dBm100 Meters
22.5mW / 4dBm10 Meters
31mW / 0dBm10 Centimetres

*The expected ranges assume an unobstructed environment between the two devices*

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