Hi Brad,

I'd have to check power draw, but might be able to power the transmitter behind the TV from USB jack on television since it's 5vdc.

I don't think there will be a need for multiple headphones at one TV, but one property will have headphones at two different TVs.  I looked through the website and didn't see that there was a way to individually address/pair headphone to base station but your comment about pushing buttons to setup multiple headphones to a single base makes me think this might be possible.

Do you know if two of these units can be used in close proximity and not interfere with each other?

Both are large estate properties so not a concern about RF interference from neighbors, but both have Panasonic phone systems with portable stations running at 2.4Ghz.