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Depending on the smartphone, your voice may be heard loudly, lag behind, or crackle during phone calls while using the INZONE Buds. This is caused by the Sidetone function of the headphones.
This feature helps the built-in microphone pick up sounds and play your voice naturally, making it easier to talk on the headphones. However, if the Sidetone function bothers you, you can turn it off or adjust the volume level. To do this, open the INZONE Hub software, select Sound Settings, and adjust the Sidetone slide bar.