Waterproof - Unique sealed design allows the Vibra-Probe to be used in the rain, mud, or under water to a depth of 100 feet. * Automatic tuning - The state of the art microprocessor controlled design requires no adjustments of any kind. * Tilt On and Off - No push button switches. The Vibra-Probe 580 turns on and off when pointed upward or will automatically turn itself off one minute after the last detection. * Pulse Induction (PI) - This technology allows hunting at the beach in salt water or in any type of soil, including black sand. * Detection depth stability - New advanced circuitry maintains the unit"s detection distance throughout the life of the battery.