Pyle PHMD4 Treasure Hunter 4000 Weatherproof Pro Metal Detector System, Includes Headphones with Integrated Circuitry Full-Featured and Easy-to-Use Metal Detector - Find Precious Metals and Treasures Buried Underground Discrimination Ability Identifies Precious Metals from Lesser Metals - Adjustable Length: 39.4 to 47.3 Inch Included Metal Detector Headphones Have Built-in Detection Circuitry - Battery Required: 9-Volt (not included) 7.8'' inch Search Coil Can be Submerged Under Water - Water Resistant Construction - 20 Hour Battery Life Motion Sweeping Detection Capability for Covering Large Areas - Adjustable Settings Located on Side of Headphones