The TreasureHound Eagle Eye is a Garrett searchcoil. It’s very large, but it will increase your depth detection range by 2-3 times more on large targets at twice the depth of standard searchcoils. It does require additional cost for the purchase of the Eagle Eye. You should also be aware that the GTI 2500 already weighs 4 lbs 8 oz with the 9.5” searchcoil attached. Switching out the searchcoil with the Eagle Eye will tack on more weight.