It is a closet resembling an outhouse. The front wooden door is printed with a halo drawn with ink, presumed to be Alice Angel's halo. It also has a sign that reads "Little Miracle Station" with another halo above it.
The inside is very blank with a small ledge near the bottom, presumably for storage or sitting on, and with a metal plate tilted on the wall like a changing room.
Several of the stations appear constantly throughout Chapter 3, and can be utilized by Henry to hide from any attackers, most notably "Bendy" and the Projectionist.