Sescom FSL-4 Three-Sided Light for Permanent Installation (STOP/STUDIO IN USE)

The FSL-4 Three-Sided Light from Sescom says STOP on the front and STUDIO IN USE on the right and left sides. It's a non-flashing light with red lettering. It can be ceiling- or wall-mounted, and can be used indoors or outdoors. The light is AC-operated and recommended to be hardwired to a 110V junction box. It measures 9 x 6 x 4.75".