The adjustable sensitivity of Klondike Premium metal detector and the discrimination of metals help you in separating different metals and reduce the number of error signals. The adjustable shaft and armrest guarantee you a metal detector that is comfortable to use. You can connect a standard 3.5mm headphones to the headphone jack so that you can recognize sounds more accurately. The watertight coil also ensures that small splashes do not hinder the use of the detector. The unit is powered by two 9V batteries (not included) and the LED indicates when the battery is low.