Our Headhunter PULSE was designed to do one thing very well... Punch deep in high mineral sand and salt conditions for GOLD! Newly engineered PULSE circuitry now fits into our acclaimed headphones making it the most compact underwater PI metal detector in the world today. The Headhunter PULSE has been engineered to perform in both salt and fresh water. The Headhunter PULSE circuitry is controlled by a unique new Frequency control that re-tunes the sensitivity of the Headhunter PULSE to be responsive to selected metals without losing its depth toward the selected metal. Unlike other PI detectors, turning the frequency control back from the higher frequency position will not result in a loss of depth for the detector. Check out the new updates for the improved model!