A:AnswerHi, k1dpr!
Yes, as long as your Bluetooth headphones support the A2DP Bluetooth profile. You may check the link below for more details:
https://www.sony.com/electronics/support/televisions-projectors-lcd-tvs-android-/xbr-55x800g/articles/00159290
~Earl
A:AnswerHi, beany! It is a device that allows you to control a set-top box (cable/satellite box) using the TV's remote. You may refer to this link for more information:
https://helpguide.sony.net/tv/gusltn1/v1/en-003/04-08-02_01.html
~Ralph
A:AnswerHi, Headphones!
Please refer to this link for a list of compatible Android TVs that supports Bluetooth headphones. https://www.sony.com/electronics/support/articles/00159290 -Sam