Bluetooth module class refers to the power output of a Bluetooth module, which is a circuit board that contains the Bluetooth radio and associated components. The Bluetooth module class is important because it determines the range and signal strength of the Bluetooth connection between the module and other Bluetooth devices.
Like Bluetooth devices, Bluetooth modules also have three classes:
Class 2: Modules in this class have a lower power output than Class 1 modules and can transmit up to 10 meters (33 feet) in open space. Class 2 modules typically have a power output of 2.5 mW.
Class 3: Modules in this class have the lowest power output and can transmit up to 1 meter (3 feet) in open space. Class 3 modules typically have a power output of 1 mW.
|Bluetooth Class||>Maximum Power||Operating Range|
|Class 1||100 mW (20 dBm)||100 meters (328 feet)|
|Class 2||2.5 mW (4 dBm)||10 meters （33feet)|
|Class 3||1 mW (0 dBm)||1 meter (3feet)|
The Bluetooth module class is important to consider when designing a product that uses Bluetooth technology. For example, a Class 1 Bluetooth module may be more suitable for a product that requires long-range connectivity, such as a Bluetooth speaker, while a Class 2 module may be more appropriate for a product that requires shorter-range connectivity, such as a Bluetooth headset.