Vexilar FL-8SE GENZ Pack w/19 Ice Ducer [GP0819]FL 8SE GENZ Pack w 19 Ice Ducer Years in the making, this classic design has been improved even more by ice fishing legend Dave Genz. Dave has made his Blue Box" nearly indestructible so it will last for years of hard use. Genz redesigned the battery storage compartment and added a universal transducer holder system. The Blue Box can also accept the full line of Vexilar accessories like a Battery Status Indictor, Vexilar Flex Light or even a Dual Beam