Improve your visibility underwater with this blue 500-Dives Water-Activated Flashing Marker Light from Innovative Scuba Concepts. The flashing light turns on when it comes in contact with water and is extinguished by drying it off. A disposable item, this light is supplied with non-replaceable batteries and also includes a handy wrist lanyard.
This product may contain mercury. Consult your local environment authorities for regulations regarding how to properly dispose of products containing mercury.