The Fisher F11 makes treasure hunting easy! The three modes of operation will let you select from jewelry, coin, or artifact types. The easy to read display features a 9-segment visual target Id, a 4-tone audio ID, and 6 levels of adjustable sensitivity and volume. It operates on one 9-volt battery and is ultra-lightweight: only 2.3 lbs.! The F11 features a 7" concentric elliptical waterproof searchcoil and functions at an operating frequency of 7.69kHz. The Fisher F11 is a great metal detector for the intermediate treasure hunter. Batteries not included.