The Promar 1.5″ Diamond Submersible Strobe Lightsare water activated and submersible deep drop strobe lights that attract interest from baitfish, gamefish, and squid. A self-contained lithium battery provides over 300 hours of use for most of the colors (100 hours for the Disco). Attach these lights on squid jigs, bait rigs, deep water rigs, and even on life jackets for safety purposes.