Treasure Cove TC-7010 Underwater/Surf Metal Detector Ideal for scuba diving, snorkeling, or wading (can be used on land) -- Includes integrated waterproof headsets 10-inch search coil that works up to 10 meters (33 feet) under water Sensitive to treasures buried up to 8-Inch under sediment The latest in state-of-the-art discriminating technology; audio alarm & red LED flash alert Operates up to 10 hours with (8) AA batteries (not included)