Humminbird 4089701 571 HD DI Portable Down Imaging and DualBeam Fishfinder with Soft Portable Case Depth: 250 ft (DI) 600 feet Mounting: Quick Disconnect or In-dash Down Imaging and DualBeam PLUS SONAR with SwitchFire 5 inch monochrome HD display Portable case, suction cup transducer and 12v battery and charger 5 inch Display * 640 X 320 Pixels * Down Imaging: 455khz/75 -10db 800khz/45 -10db * Dual beam Plus With Switch fire: 200khz/28 -10db