2RU BOX OFFICE sign with Enclosure.For use in professional recording & broadcast studios, home studios, school, auditoriums & theaters. These illuminated signs use high-efficiency LED lights for years of dependable service.Easy to install in just minutes and includes UL Listed power supply. Additional flash module and 4 button contorller is also available. LED lights are rated up to 50,000 hours of use life. Size - 20.5" (L) x 4.75" (H) x 4.5"(D)The facility name or call letters can be added on for $50.00. Call us for details!