Years in the making, this classic design has been improved even more by ice fishing legend Dave Genz. The 'Blue Box' is nearly indestructible to last for years of hard use. The battery storage compartment is redesigned with a universal transducer holder system. The FL-20 is the next generation of 3-color, flasher/finder technology. The new look with its streamlined, flat surface delivers a larger display that won't trap rain or snow and increases the viewing angle by 50 percent. The simple to operate system only requires two control knobs. The FL-20 offers ten steps of interference rejection and a 20 ft. Low Power range setting option for use in super shallow water or thick weeds. A new enhanced receiver gives you cleaner signals and less noise. Each Genz Pack Combo comes with a 12 volt, 7 amp-hour battery with charger and an Ice-Ducer transducer.