The maximum power for Bluetooth Class 1 devices is 100 mW (20 dBm). This power output allows Class 1 devices to achieve the longest operating range compared to other Bluetooth classes.
Bluetooth devices are categorized into different classes based primarily on their maximum transmitting power, which directly impacts their potential operating range. The reference material provides a clear breakdown of these classes:
| BT Class | Maximum Power | Operating Range |
|---|---|---|
| Class 1 | 100 mW (20 dBm) | 100 meters |
| Class 2 | 2.5 mW (4 dBm) | 10 meters |
| Class 3 | 1 mW (0 dBm) | 1 meter |
As shown in the table from the Ezurio reference (What is Bluetooth Class?), Class 1 devices are designed for applications requiring a greater range, such as connecting to devices across larger rooms or even between different rooms in a building, provided there are no significant obstructions.
Understanding Bluetooth Power Classes
- Class 1: Operates at the highest power (100 mW / 20 dBm), designed for long-range communication up to 100 meters (approximately 330 feet) in ideal conditions. Common in devices like Bluetooth USB adapters, industrial equipment, or medical devices needing extended range.
- Class 2: The most common class for devices like smartphones, laptops, and headphones. It operates at a lower power (2.5 mW / 4 dBm) with a typical range of up to 10 meters (approximately 33 feet).
- Class 3: The lowest power class (1 mW / 0 dBm), with the shortest range, typically limited to 1 meter (approximately 3 feet). Less common in consumer devices today.
The actual achievable range can vary significantly depending on factors like environmental obstructions (walls, floors), interference from other wireless devices, and the antenna design of both the transmitting and receiving devices. However, the power class sets the maximum potential range under optimal conditions.
