Does the power indicator turn on when you remove the headset from the charging case?
Example) Location of the WF-1000XM3, WF-SP900 power indicator
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Blue indicator flashes
The headset is turned on normally.
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Blue and red indicators flash alternately/Blue indicator flashes twice at a time
The headset is in Bluetooth pairing mode. When using the headset for the first time after purchase, or when turning it on after initializing, it will automatically be in pairing mode, so you can connect to the Bluetooth device that you want to.
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Blue indicator does not turn on