FeaturesHeadphone jackTune ControlExtending 570-880 mVolume ControlFerrous/Non-Ferrous discriminatorThis all-round metal detector is the perfect starter model. The Altai Treasure Seeker 1 Starter Metal Detector has a 170 mm waterproof coil and an extending metal shaft for ease of use. The unit features a visual as well as audible indicator and a tune control to enable the unit to be tuned to individual conditions. The detector also features a discriminator control to distinguish iron or steel from silver or gold.