This wired fish finder has the following advantages: Water Temperature measurement is displayed in either °C or °F, Auto & Manual range selection. This amazing product can be used in Ocean, River, Lake and even on Icy Water for Ice Fishing. The sonar is able to detect school of fish in any particular area and can be mounted in 4 different ways: Fix it to the boat hull Fix it on a pole Use a float on the cable Cut a hole on the ice surface Features: Auto & Manual Depth range Zoom at specified depth Adjustable depth alarm setting Adjustable 5 different selectable sensitivity settings Adjustable 4 chart speed setting Selectable Meter and Feet depth units 4.6cm or 46mm diameter Round transducer sensor with 25ft cable, 45-degree beam angle and removable float With simulation mode Can be used as a fish finder and a depth sounder Audible Fish Alarm with on/off feature Shows the fish depth location in units or in specific depth figures Displays live update of the Water Bottom Contour Clear fish icon with on/off feature Battery strength indicator Resist the interference from grass when used in lake Has both CE & RoHS approval Specifications: Display: Big Adjustable High-contrast Dot matrix FSTN LCD 128Vx64H Screen size: 43 x 48mm (W x H) Sonar Frequency: 200kHz Round Transducer Sensor: 45-degree beam angle Bottom contour: Show true changing of water bottom contour Depth Range (Min/Max) : 2~240ft (0.6~80m) Water Temperature Indicator in Celsius (°C) / Fahrenheit (°F) User selectable meter or feet readings Backlighting: white LED with on/off feature Water Resistant Design / Level-4 (spray-water-proof) Operational Temperature: -4~158°F (-20~70°C) Power Supply: 4 x AAA Alkaline Batteries (not included) Set Includes: 1 x Professional Fish Finder 1 x 4.6cm or 46mm diameter Round Transducer Sonar Sensor with 25ft cable 1 x Removable Transducer float 1 x Transducer adapter 1 x Stainless Bolt 1 x Stainless Wing Nut 1 x Neck Strap/Lanyard 1 x English Instruction Manual