I saw this black dial knob in bathroom of multiple hotel rooms. It is numbered from 0-10.

Any idea what is the use of it?

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It seems not a timer. It didn't tick back. Changing it didn't -apparently- change anything.

  • 11
    @Dorothy: Pretty sure that object is a telephone. Nov 19, 2016 at 15:29
  • 3
    @NateEldredge Maybe OP could add some info, such as where he is, and whether there is a heat lamp in the ceiling.
    – Giorgio
    Nov 19, 2016 at 15:32
  • 3
    It's just volume for background music, which was popular for awhile but usually just disconnected these days. Ask the staff!
    – Fattie
    Nov 19, 2016 at 17:23
  • 4
    Ideally it would go to 11. Nov 20, 2016 at 1:53
  • 6
    If it’s defunct, you have a great oppertunity to add your own label as a gag. Say, “shower pH”.
    – JDługosz
    Nov 20, 2016 at 5:29

1 Answer 1


Usually this controls the volume of an auxiliary speaker placed in the bathroom ceiling, connected to the room’s television. Presumably a number of people continue to listen to their television programmes as they go about their bathroom activities, although the utility of this innovation is rather lost on me.

It appears to do nothing if the television is not on.

The speaker may no longer be connected to anything if the television has been replaced since the hotel was last renovated.

  • 10
    I would guess a lot of business people like listening to the (stock) news in the morning
    – PlasmaHH
    Nov 19, 2016 at 19:25
  • 3
    It's possible to receive radio broadcasts as well as television on many TV sets. It isn't unusual to listen to the radio in the bathroom.
    – bdsl
    Nov 20, 2016 at 14:06
  • 2
    It certainly beats most of the alternative sound sources in the bathroom. Nov 20, 2016 at 16:07

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