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The USB connector of your A300 is in the device inside the wristband. You need to detach the wristband for setting up your A300 with a computer, charging the battery and changing the wristband.

  1. Bend the wristband from the buckle side to detach it from the device.

  2. Hold the wristband from the buckle side. Pass the wristband over the buttons first from one side and then from the other side. Stretch the wristband only when necessary.

  3. Pull the device from the wristband.

To attach the wristband, perform the steps in the reverse order.