The transmission distance of Bluetooth earphones is not related to the Bluetooth version, but depends on the Bluetooth technology PowerClass. ‌

Bluetooth technology, as a short-range wireless communication technology, its transmission distance is mainly affected by the PowerClass used by the device. Currently, most mobile phones and devices use PowerClass 2, with a standard transmission distance of 10 meters. The upgraded PowerClass 1 can increase the transmission distance to 100 meters. Both versions support A2DP stereo transmission protocol, allowing Bluetooth earphones to interconnect with stereo earphones. In practical use, the optimal transmission distance between mobile phones and Bluetooth earphones is usually within 7 meters. If it exceeds 8 meters, there may be signal interruptions, and if it exceeds 10 meters, Bluetooth devices may lose connection.

In addition, the transmission distance of Bluetooth earphones is also affected by the actual usage environment. For example, if there are no large obstacles in the middle, the transmission quality will be better. Moreover, the distance between the phone and Bluetooth earphones is directly proportional to the call noise. When using stereo Bluetooth earphones to enjoy music, if the distance from the phone is too far, it is easy to experience intermittent phenomena.

It is worth noting that although the theoretical transmission distance of Bluetooth 5.0 version can reach 300 meters, this requires commercial or industrial grade devices with high power and optimized antennas, and such devices are not commonly found in personal communication products. Therefore, for most consumers, it is more practical to understand the standards of PowerClass and the factors that affect transmission distance.

In summary, although the continuous updates of Bluetooth versions may bring technological progress, such as Bluetooth 5.0 which has significantly improved speed, range, and data transmission compared to previous versions, and has added indoor positioning assistance function, the transmission distance of Bluetooth earphones used in daily life is mainly affected by PowerClass, rather than the Bluetooth version itself