A:AnswerEach unit features only one headphone jack.
You could try to use a 3.5 headphone splitter to connect multiple headphones to the same headphone jack.
David M. - Insignia Support
A:AnswerThis product is not recommend for rear facing car seat as the screen is designed to install on headrest by the mounting strip which might not an appropriate position when you seat at rear facing seat.
David M. - Insignia Support
A:AnswerNot sure about the Bluetooth, my kids just connected their headphones to it and we bought a splitter so two can connect. It does come with mounting straps for the headrest.