MEETS ANSI FL-1 STANDARD - Meets ANSI FL-1 standard- this standard was created by the American National Standards Institute (ANSI) to provide consistent performance measurements for handheld lights. Although bicycle lights are not required to follow this or any standard, Blackburn believes in offering full transparency in how the output, run time, water resistance and other performance claims are measured
IP-65 - Ingress protection rating or IP rating is a techy way to describe the level of water and dust proofness a product has. This light meets the IP-65 Standard, which means it is totally protected against dust/grit and is fully resist strong jets of water from all directions