46 CFR §161.013-13

1. (a)Each electric light intended as a Night Visual Distress Signal required by 33 CFR part 175 must be certified by the manufacturer as complying with the requirements of this subpart.
2. (b)Each electric light must be legibly and indelibly marked with:
   1. (1)Manufacturer's name;
   2. (2)Replacement battery type;
   3. (3)Lamp size; and
   4. (4)The following words—
3. (c)If an electric light is designed for use with dry cell batteries the label must advise the consumer on the battery replacement schedule which under normal conditions would maintain performance requirements of § 161.013-3.