The F-Pulse from Fisher features innovative functions to find exact locations of objects. Waterproof Pinpointer - pinpoint the exact location of metal objects. Pinpoints in dirt and soil or fresh or salt water. Waterproof and fully submersible up to 10ft underwater. Constructed from special abrasion resistant materials that will not wear through. Pulse indication circuitry. Audible beep vibration or both. Lost mode alarm. Easy single button operation. 3 Sensitivity levels. Requires 2 AA batteries (NOT included). Includes belt holster.