Which Bluetooth class provides the longest maximum transmission range?

• A. Class 2
• B. Class 3
• C. All classes have the same range
• D. Class 1

Answer: (D)

Bluetooth devices are defined by how much power their radios emit, and the transmit power largely determines how far the signal can travel. The class with the highest transmit power is designed for the longest reach, so it offers the longest maximum range. In practice, Class 1 devices can reach up to about 100 meters in open space, Class 2 around 10 meters, and Class 3 about 1 meter. That’s why the longest range comes from the highest-power class. Of course, real-world range depends on obstacles, interference, and device design, so you may see shorter distances in everyday environments.