Communicates with vibration & light：When a target is located the detector signals with pulses of vibration and flashes of bright from white LED Pulse Induction Technology (PI)：Allows hunting in salt water or in any type of soil, including black sand Detection depth stability：New Advanced circuitry maintains detection distance throughout the life of the battery Target distancing：The pulses of vibration increase in frequency as the probe approaches the target precision pinpointing Automatic tuning：The state of the art microprocessor controlled design requires no adjustments of any kind