It has been proven that many species of fish have a strong sensitivity to electrical energy in the water. Salmon, trout and sharks are among these. Galvanic action causes electricity to flow from your boat to your downrigger cable. Many factors can create an electrical field around your boat that is unattractive to fish, or worse could actually repel fish. Commercial salmon trollers on North America's west coast are very much aware of this phenomenon and spend thousands of dollars to regulate the  voltage condition on their trolling lines. They do this by the use of a "black box"; a device that controls the actual voltage on the lines. Russell Electronics Ltd. has been the internationally recognized leader in this field for over 30 years and has joined with "Scotty" to produce a Black Box for the sportsfisherman. Now you can dial in the best voltage for the species you are targeting.

No. 1201 Black Box (digital with pulse mode)
Includes wiring harness and stainless steel contact sleeves for 2 downriggers.