If you have only ONE OPTICAL Output from TV, and it is currently used by your AV receiver or soundbar, you need to use the Bypass function.
TV <=== optical cable ===> Oasis <=== optical cable ===> Soundbar / AV Receiver
In this way, you do not need to plug and unplug Oasis each time when you need to use / not use Bluetooth. A simple slide switch on the right side will allow you to switch between these two mode.
Actually, in this setting, Oasis can be used as an bluetooth transmitter and stream audio to your Bluetooth headphones.
Also it can be used as an Bluetooth receiver. You can stream audio from PC / Cellphone to Oasis and play from the soundbar.
If you need to have wired output and Bluetooth at the same time, then you will need to use Oasis Plus, coming in April 2018. Here is Amazon link.
Here is a video guide of how to use Oasis Bypass function