This Big Blue night diving marker light is bigger, brighter, stronger and more color options for 2018, this light is our new version of a multi-color marker light for Scuba divers. Low light output so it is not distracting but bright enough to be seen by other divers. This light easily clips on to mask straps, belts, straps and any many other locations. Colors include red, green, blue, purple, orange, and yellow in single unit. All colors have a flash mode as well.