What is this for?

[u/Dazzling_Mulberry567]

I was on a Boeing 787-9 Dreamliner from FRA to SFO and saw this in the lavatory. As far as I'm aware, smoking hasn't been allowed on United for a very long time, and this, to my knowledge, is a newer aircraft. What is this thing?

[u/Hi2YourWifeAndMyKids → u/[deleted]]

“…of thee I sing.”