Bluetooth devices may have different RF power classification levels. The power versions for Bluetooth include; 1 mW - class 3, 2.5 mW - class 2, and 100 mWatts - class 1.

Devices that have an extremely low power level of 1 milliwatt have a very short range of approximately 1 meter. Bluetooth devices that have a power level of up to 100 milliwatts can provide a transmission range of approximately to 100 meters. The high power version (class 1) is required to use adjustable (dynamic) power control that automatically is reduced when enough signal strength is available between Bluetooth devices.

This figure shows the different types of power classes that are available for Bluetooth devices. This table shows that class 3 Bluetooth devices are very low power (1 mW) and are used for very short range communication (1 meter). Bluetooth class 2 devices can produce 2.5 mW, which are good for personal area communication (approximately 10 meters). Class 1 Bluetooth devices can operate at up to 100 mW and can communicate over a range of approximately 100 meters.