CFR › Title 33 › Part 149 › §149.67033 CFR §149.670Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkEach of the following must be marked with the words “General Alarm” in yellow letters at least 1 inch high on a red background:(a)Each general alarm box; and(b)Each audio or visual device described under § 149.665 of this part for signaling the general alarm.