Premiere Edition Underwater Metal Detector by Barska features 100% submersible metal detector works in fresh and salt water up to 32.8 feet/10 meters. Features two operation modes adjustable knobs for sensitivity discrimination sensitivity and volume control for headphones (included) and a low battery indicator and a 10'' search coil. Operates on 8 AA alkaline batteries (not included). LED light flashes red when a target is detected and audio tone will have a distinct pattern depending on what has been detected. 1 Year limited warranty. Adjustable knobs for sensitivity LED light flashes when target is detected | Barska BE11924 Premier Edition Underwater Metal Detector in Red