The HawkEye FishTrax 1C Portable Fish Finder is designed for skilled anglers desiring high-definition fishing capabilities. The HawkEye FishTrax 1C is packed with features such as Dual-Frequency FishTrax Intelligent Sonar, VariableZone Water Temperature, Water Depth Detection, Fish Depth Identifier, HD Bottom Landscape Painting, Ice-Mode Digital Flasher Portrayal, and much more. Additional features include audible fish and depth alarms, auto zoom bottom tracking, multi-level depth ranges, EasyTouch User Interface, and included trollable, floatable, boat mountable Airmar transducer so you can take your fish finder anywhere. The HawkEye FishTrax 1C Portable Fish Finder is incredibly easy to use: Simply turn the unit on, toss the floating sonar sensor from the boat, bridge, or shoreline and instant fish, weed, bottom contour, and depth readings are available in the palm of your hand. HawkEye FishTrax 1C Portable Fish Finder Features: User Selectable Dual Beam FishTrax Intelligent Sonar Delivers Precise Fish Finder Readings up to 240ft in 1/10th Precision100-Level Sensitivity Adjustment, Auto Zoom Bottom Tracking, and Multi Level Depth Ranges Intensify Prey TargetingAdaptive Software Programming Minimizes False ReadingsEasyTouch User Interface Makes System Setup and Adjustment SimpleGlare-Free VirtuView HD Color Display offers High Def Imaging and Superb ReadabilityAudible Fish & Depth Alarms Signal Changes in Water Depth and the Presence of FishVariableZone Water Temperature Sensor Shows Water Temperature Throughout the Water ColumnIce-Mode Digital Flasher Portrayal Fine Tunes Display for Ice FishingSonar Sensor is Floatable, Trollable, and Boat Mountable for Unmatched PortabilityBuilt-In Expandability Allows Additional AccessoriesFor the depth and fish sonar features of this unit to function properly, the sonar sensor must be in direct contact with a boat hull or the water as per the instructions in the operator’s manual. Readings are NOT obtainable through the air.