Features: Get the approximate location of fish and the depth of water. Display the nature or circumstance of bottom of Sea (i.e. grass, rock and sand). Round transducer sensor with 7.5 m cable, 45-degree beam angle. With fish depth scale and audible fish alarm. User selectable meter or feet readings. Range of depth readout up to 100 meters. Removable float Specification: Display : TN/ANTI-UV LCD Backlighting: green LED Powered by : 4 x AAA batteries (NOT included) Measurement units: Feet and meters Depth range :100m Sensor Beam Angle :45 degrees Operating temperature : -20 Celsius to 70 Celsius (-4 Fahrenheit to 158 Fahrenheit) How to Use: A. Fix it to the boat hull B. Use a float on the cable to mount the sonar inside the water C. Fix it on a pole and push it into the desirable position inside the water D. Cut a hole on the ice surface and place the sonar under the water