I just got the Roku Ultimate with Pro remote.
It says in the notes that the remote can be used for listening while charging.
When I went to plug the cable into the charging block (the cable was already plugged into the remote) there was an arc of electricity from the charging block to the cable,
I saw it arc before the cable was plugged in, still about an inch away, and I felt that arc go through the headphones and it zapped my ear.
I'm pretty sure that it was muted at the time, so shouldn't have been drawing power at that moment.
There are no warnings about this possibility in the manual. Someone could get hurt.
I was just in the middle of watching a show and the remote low power warning came up on my tv, so I went to plug it in and charge it while I finished watching the show.
I'm really grateful that the power was DC low voltage or I could have had a bad shock.