The HawkEye FishTrax 1 Portable Fish Finder is perfect for entry level fishermen seeking ease of use and affordability. With an incredible array of features such as FishTrax intelligent sonar, an audible fish alarm, VariableZone water temperature sensor, and weed/rock indicators, you’ll never believe the HawkEye FishTrax is a handheld fish finder! This battery operated fish finder utilizes 4 AAA batteries to achieve an incredible battery life of 30 hours. Additional features include glare-free backlit icon LCD, EasyTouch user interface, and included trollable, floatable, boat mountable Airmar transducer so you can take your fish finder anywhere. The HawkEye FishTrax 1 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 1 Portable Fish Finder Features:5 User Selectable Sensitivity SettingsFishTrax Intelligent Sonar Delivers Precise Fish Finder Readings up to 240 ft. Glare-Free Icon LCD with LED Backlight offers Excellent ReadabilityAdaptive Software Programming Minimizes False ReadingsEasyTouch User Interface Makes System Setup And Adjustment EasyAudible Fish Alarm Signals the Presence of FishVariableZone Water Temperature Sensor Shows Water Temperature Throughout the Water ColumnRock and Weed Indicators Indicate Bottom CompositionAirmar Transducer is Floatable, Trollable, and Boat Mountable for Unmatched Portability ()Built-In Expandability Allows Additional AccessoriesSonar Sensor Side-Scan Adapter Allows Sonar Direction Finding Under Ice, Docks, Weeds, etcIncludes User Friendly Color Coded Operation Manual and Free Access to a 24 Hour Online Technical Support() For 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.