The Vexilar FLX-28 Ultra Pack Lithium is the pinnacle of ice fishing sonar technology. Featuring a brushless data transfer system for a sun-readable, high-resolution display, this unit provides anglers with unparalleled detail of the water column. This "Ultra Pack" configuration comes professionally housed in a heavy-duty carrying case with an integrated master power switch and a lightweight lithium battery, ensuring you stay on the ice longer with consistent, reliable power.