It is a kind of wood sand timer, usually for sauna, so we also call it a sauna shower timer.
The time is 15 minutes.
Both the body and the frame made of wood. You can put the timer on the wall by the screw.
See the frame, and there are two holes for you to knock nails into the wall.
Glass bulbs are into the wood body. So it is not easy to break.
There are scales on the wood beside the bulbs. So you can see the exact time when you take a bath.
When the sand all down you can rotate it upside down and start again.