You gain a Bonus equal to the item’s Tier on skill checks to Hide, Sneak, Track, and Cover Tracks, and on attack rolls against creatures that you are Undetected or Unnoticed by.
You gain Scent as an Imprecise Sense with a range of 15 feet per Tier of the item. If you already had Scent as an Imprecise Sense, its range is instead increased by +10 feet per Tier of the item.