While I am in consideration to buy Roku streaming device, I found Headphone Mode as an interesting and unique feature.
I doubt if this is available on all the models. A clear guidance will be appreciated. So, I will consider the supported models during my purchase.
No. Headphone Mode is available only on some Roku models that come with a remote featuring a headphone jack. As of now, Headphone Mode is available on Roku Streambar SE, Roku Streambar, Roku Streambar Pro, or Roku Smart Soundbar. You can use this feature only while streaming content using its built-in streaming player. Remember that headphone mode will not work if you play content from external devices.
If your remote lacks a headphone jack, you can still experience private listening on Roku TV through "The Roku app" on your smartphone. I would recommend you buy the Roku device that supports headphone mode, as it lets you stream movies and other video content privately.