Wolf's "In Use" signs are available with "X-ray In Use," "MRI In Use," "Darkroom In Use," and "CT In Use" messages. Manufactured of steel and lit by two 15-watt tubular bulbs, the 7"H x 12"L x 2-1/2"D box has your message on both sides for hanging projected over the door (or against the wall or ceiling). The unit is finished with a white polyester powder finish and comes with pigtails for direct wiring.