The sound signal required by §§ 67.20-10, 67.25-10, and 67.30-10 must:

1. (a) Have its maximum intensity at a frequency between 100 and 1,100 Hertz;
2. (b) Sound a 2-second blast every 20 seconds (2 seconds sound, 18 seconds silence) unless otherwise authorized by the District Commander;
3. (c) Have the rated range required by § 67.20-10, § 67.25-10, or § 67.30-10;
4. (d) Have a height not exceeding 25 feet;
5. (e) Have not more than eight sound sources;
6. (f) Be approved by the Coast Guard under § 67.10-15; and

7. (g) Be permanently marked with:

   1. (1) The date of Coast Guard approval;
   2. (2) The manufacturer and date of manufacture;
   3. (3) A model designation;
   4. (4) The approved range; and
   5. (5) The power necessary to comply with the provisions of paragraph (c) of this section.