The 2.5 mm headset standard is hello to 2022, when this model was developed (at that time the most popular standard.), It is difficult to find it, but it is possible. I took it for cycling over long distances, including where there is no mobile connection. Suitable for my needs. The call quality is good, the sound is clear. It is not for nothing that for almost 15 years it has been included in the list of best-selling models (other manufacturers also make under license)
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