Underwater headphones (required for water hunting and diving). Waterproof to 200 feet. For use with Garrett CSI Pro, AT Gold, AT Pro, ATX, Infinum LS, and Sea Hunter Mark II metal detectors. Headphones shipped as standard with CSI Pro, Infinium LS, ATX, AT Pro and AT Gold are LAND TYPE ONLY. They cannot be submerged in water. If you are going to submerge your head to snorkel or dive, you must have underwater headphones made by Garrett.