Years in the making, this classic case design has been improved even more by ice fishing legend Dave Genz. Dave created his "Blue Box" over 30 years ago. It was indestructible, so it will last for years of hard use. Genz has redesigned the battery storage compartment and added a universal transducer holder system. Now called the Genz Pack, it can also accept the full line of Vexilar accessories like a Battery Status Indicator, Vexilar Flex Light or even a Dual Beam Ice-Ducer transducer.