The Garrett AT Gold features advanced, proportional (Pro) audio modes. This allows the user to hear subtle changes in a target's response. Proportional audio also helps the user to better judge a target's size, shape and depth and has the additional benefit of a much faster recovery time when detecting adjacent targets. AT Gold allows you to conquer any terrain with manual and automatic ground balance features, plus exclusive Garrett Ground Balance Window -- which allows the user to "spread" the ground balance setting to reduce response to subtle ground variations. The Iron Audio feature allows you to hear iron trash before you dig it! Also includes True All Metal Mode, All Metal Iron Mode, Ground Target Analyzing, Digital Target ID, and Adjustable Threshold to better hear targets. Special Promotion Bonus Item: Pro-Pointer AT Pinpointer (PN 1140900).