Bluetooth headsets, like other Bluetooth devices, need to be paired with a mobile phone before use.
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The button on the Bluetooth headset case can reset the headset and make the headset enter the start pairing state, which is to turn on the Bluetooth headset with the mobile phone to scan the Bluetooth headset and complete the pairing with the Bluetooth headset.
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The button on the outside of the Bluetooth ear case is used to pair the Bluetooth headset with the mobile phone, and is also the Bluetooth restart button, which can restart the Bluetooth headset to connect to other devices.