Humminbird 4090501 386Ci DI Combo Down Imaging with DualBeam Color Fishfinder and GPS Depth: 250 ft (DI) 600 feet Mounting: Quick Disconnect or In-dash Down Imaging and DualBeam PLUS SONAR with SwitchFire 3.5 inch 256 color display Precision GPS and built-in Unimap 35" Display 320 X 240 Pixels 256 Color Options * Dual beam Plus With Switch fire: 200khz/29 -10db 455khz/16 -10db