Humminbird 4089901  581i HD DI Combo Down Imaging and DualBeam Fishfinder and GPS (Discontinued by Manufacturer) Depth: 250 ft (DI) 600 feet Mounting: Quick Disconnect or In-dash Down Imaging and DualBeam PLUS SONAR with SwitchFire Precision GPS and built-in Unimap SD Card Slot Ultra High-resolution * 640 X 320 Pixels * 5" Display * Dual beam Sonar * 2,000 Watts Ptp Power