Tuna Magnet - The MAKO-MAGNET is an easy device to use- and it works on the the exact frequency that has been proven to attract MAKO SHARKS. Just hook it up to your boat battery- place the transducer in the water and the device is automatically activated- that's it. The MAKO-MAGNET is now emitting a rich low frequency tone- while acoustically vibrating the water in a 360 degree pattern. You are now being heard a minimum of a 1 mile under water. The rocking motion of the ocean further activates additional circuitry and breaks up the tone by adding an intermittent harmonic. This easy to use MAKO-should be caged- or it will be eaten.