Returned two P.I. Pros, and they turned them around in ONE WEEK.. only charge was the shipping. One had worn through the bottom of the coil, due to my "skimming" on the sand - not their fault. They have a new style coil, with "ribs" radiating out from the hole in the center, and NO FALSE signals when the salt water runs over the top of the coil, working along the surf line.... HUUUURRRRAAAYYYYY!!!!