The water activated flashing marker light turns on whenes in contact with water, and turn off when it dries. The 200 hour life far exceeds most marker lights on the market, and these are disposable with non-replaceable batteries.from Consumer Electronics Store http://cestore.net/camera-photo/underwater-photography/underwater-lighting/Innovative-Concepts-Activated-Flashing-Marker.html?pid=B00ESL8URC
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