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ヘッドセット ATI Electronics H300のPDF ユーザーマニュアルをオンラインで閲覧またはダウンロードできます。ATI Electronics H300 13 ページ。

Adjusting the volume

Press [ + ] on the top of the headset to increase the volume level and [ - ] to decrease
the volume level.
only your headset.
Deleting all pairing data
When the headset is on and disconnected from your phone, the pairing information can
be deleted by pressing and holding the Multi-Function button until a long beep tone
is heard.
To prevent possible harm to the environment, please separate this
device from other types of waste and recycle it responsibly to promote
the sustainable reuse of material resources.
*For your protection, the volume may not be able to be raised to its maximum level using
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