The Klondike Professional metal detector is the best metal detector in its class for both newer hobbyists as well as for the more advanced hobbyists. The Klondike Professional is able to differentiate different types of metals from one another. Each different metal type prompts the metal detector to produce a unique sound cue so you can decide whether you want to dig up the object you found or not. You can also choose to block certain metal objects from being detected. The metal detector has a headphone jack so you can connect standard headphones to it. With headphones attached, you are able to better focus on the noise the metal detector produces when it has detected metal. The sturdy handle and armrest make the detector more comfortable to use, even during longer periods of use. The length of the armrest can be adjusted in order to provide your arm optimal support. The watertight coil also makes sure that the device is not affected by small splashes. The length of the arm between the coil and the control unit can easily be adjusted as well. Technical information: Sensitivity adjustmentMetal discriminationOperating modes: 4 + 1:Motion: All Metals, Discs, Memory, JewelryNon-Motion: PinpointEffective detectionBacklit 2.2" LCD displayCoil diameter 25.4 cm (watertight)Adjustable armrestHeadphone jack: 3.5mmPower supply: two 9V alkaline batteries