This Fish Finder has wide range wireless sensor and high-contrast 4-level grayscale FSTN LCD. It has (1) alarm that can be set to alert the user on the size of the detected fish and a (2) audible alert once the wireless communication has been cut off. The Wireless Sonar/Sensor can be used with Rod & Lines, Roach Pole and Bait Boats while the Wired Transducer can be mounted in 4 different ways such as Boat Hull, Floats, Poles and Ice. This comes with transducer & mount with suction crater ascent system for hanging on boat, vessel or buoyant boat vessel underneath the water line to which they are utterly submerged. Features: 8-LED Backlight setting Adjustable Sonar Sensitivity, Contrast, Depth Range, Fish & Depth alarm (with disable feature), 3 Fish size alarm (with disable feature) settings Auto & Manual Zoom Function Display Live-Update of Bottom Contour Fish depth location in units or in specific depth figures Fish ID Display: Large, medium and small fish symbols (3 fish size display) Bottom View: :( Structure ID, Black, White Line, Inverse ) Battery strength indicator and Power save mode Big and small fish identification, detects schools of fish in any particular area Supplies Transducer with Transom Mount w/ crater suction cup system Built-in memory stores sonar setting when the unit is turned off Specifications Display: 3.9inch high-contrast 4-level grayscale FSTN LCD, pixels:160V X 132H 2 modes of use: Wireless Mode/Cable Mode Back lighting: On/off White LED Built-in Temperature Sensor Water Temperature Indication: Celsius and Fahrenheit Depth Capability : Cable transducer:328 ft (100m) Wireless: 196 ft (60m) Sonar Coverage: Cable transducer: 45° beam angle Wireless: 90° beam angle Sonar Frequency: Cable transducer: 200Khz Wireless: 125Khz Operational Temperature : -14 ~ 122°F(-10°C-50°C) Transducer Cable Length: 24 ft.(8m) Wireless operational Range : 492ft (150m) Wireless Sensor Battery Requirement : 1 x CR-2032 battery(replaceable) Power Requirement: 11V ~ 13V DC Set Includes: 1 x 2-in-1 Fish Finder Wireless/Wired (FF-918N2) 1 x Wireless sensor (CR-2032 battery included) 1 x Transducer 1 x Suction cup mount for transducer 1 x Power cable English User Manual