The Bounty Hunter Discovery 3300 Metal Detector is from Bounty Hunter's recent line of feature packed and easy-to-use Discovery Series metal detectors. The entire line of Bounty Hunter metal detectors operate on two 9-Volt batteries and are designed to be lightweight and ergonomic for easy handling and comfortable use. Their standard motion all-metal mode detects all types of metal while the progressive discrimination control eliminates iron and other unwanted items. As the metal detecting coil nears a target the Discovery 3300 three-tone audio feedback aids in distinguishing between valuables and undesirable metals. This model also comes equipped with a 1/4 " headphone jack compatible with most headphones for privacy while treasure hunting. In addition Bounty Hunter equips all their metal detectors with a preset ground balance that neutralizes the response to mineral content in the ground.