Bluetooth has three classes, namely:

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Bluetooth has three classes, namely:

Bluetooth uses three power classes that determine how far a device’s signal can reach. The naming is Class 1, Class 2, and Class 3, with typical ranges of up to 100 meters for Class 1, about 10 meters for Class 2, and around 1 meter for Class 3. These ranges come from the corresponding transmit power levels (roughly 100 mW for Class 1, 2.5 mW for Class 2, and 1 mW for Class 3). Real-world range can vary with environment and interference, but these categories are the standard way Bluetooth devices are described. The other options don’t fit because they either refer to something unrelated to Bluetooth’s class naming (the ISM band reference in Industrial, Scientific, Medical), use nonstandard letterings (I, M, R or A, B, C), or mix terms that don’t describe Bluetooth classes.

Bluetooth uses three power classes that determine how far a device’s signal can reach. The naming is Class 1, Class 2, and Class 3, with typical ranges of up to 100 meters for Class 1, about 10 meters for Class 2, and around 1 meter for Class 3. These ranges come from the corresponding transmit power levels (roughly 100 mW for Class 1, 2.5 mW for Class 2, and 1 mW for Class 3). Real-world range can vary with environment and interference, but these categories are the standard way Bluetooth devices are described.

The other options don’t fit because they either refer to something unrelated to Bluetooth’s class naming (the ISM band reference in Industrial, Scientific, Medical), use nonstandard letterings (I, M, R or A, B, C), or mix terms that don’t describe Bluetooth classes.

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