Samsung HM6450 - Manual (Page 30)

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DB deletion
When the headset is paired with your phone, it automatically saves information
from the phone, such as the Bluetooth address or device type. With the DB
deletion feature, you can delete all saved information from your headset.
In Pairing mode, simultaneously press and hold both Volume buttons 1.
for 4 seconds. You will hear “DB deletion mode.”
Press the Volume down button.
2. You will hear “Deletion completed.”
If you don’t press the Volume down button within 5 seconds, you will hear, •
“Cancelled.” And the Headset will enter Pairing mode.