The Tru Trip Deep Divers float when at rest and dives down taking your lure with it when trolled. Fishing depth is controlled by boat speed, lure weight and the amount of fishing line let out. Tru Trip can be easily be set to other depths using the included chart. When a fish strikes, the trip mechanism disengages allowing you to fight the fish with no drag from the Tru Trip. The Tru-Trip deep diver is a favorite among Great Lakes charter captains when trolling crawler harnesses and spoons.