Welcome to the Bose Community!
I'd love to help answer your question. Could you please confirm which headsets you are referring to?
Thanks for confirming. There is no difference between the functionality of the headsets, they're just designed specifically for comfort on your preferred side (left/right)
Let me know if you have any further questions.
I have BOSE Bluetooth Headset Series 2 and it is fully charged.
Thanks for confirming this @garden54.
The Green LED while in use means that the headset has 1 to 4 hours of talk/streaming time remaining.
The Blinking Blue LED can mean two things depending on the speed of the flash. If it is flashing slowly the headset is discoverable for pairing. It will remain in this state for up to 5 minutes or until it begins connecting to a device.
If the LED is blinking fast the headset is attempting to connect to a mobile phone or is receiving a call. I would recommend checking out page 13 of the owner's manual here, to ensure that you are correctly paired to the device.
I look forward to hearing back from you with the result of this.