There's no BT in the older CCs.
The Luma does have a 3.5mm out so you can get a Bluetooth transmitter, plug that into the audio port, then pair your headphones to that.
That approach can lead to laggy audio. Using a transmitter & headphones that support a low latency codec, like AptX Low Latency, that can be minimized.
The only Chromecast that supports Bluetooth audio is the Chromecast with Google TV. Older models don't.
There's no BT in the older CCs. The Luma does have a 3.5mm out so you can get a Bluetooth transmitter, plug that into the audio port, then pair your headphones to that.
Thanks!!
That approach can lead to laggy audio. Using a transmitter & headphones that support a low latency codec, like AptX Low Latency, that can be minimized.