Fishfinder Sonar Radio Sea Bed Contour Live Upate W/ Alarm C & F 40m / 131ft Digital Wireless DOT Matrix Fish Finder (LK-FF-03)

"Wireess Fishfinder / Fish Finder Features:
1) Depth Range Max/Min: 120Feet(35meters)/2Feet(0.7meters)
2) Wireless sensor: 90-degree beam angle
3) Display: Big Adjustable High-contrast DOT matrix FSTN LCD 128Vx64H
4) Display size: 41Wx48H
5) Back lighting: On/off White LED
6) 125kHz sonar frequency
7) Temperature unit: Celsius/Fahrenheit
8) Wireless operational Range: 120Feets(35meters)
9) Power Requirement: 4-AAA alkaline batteries
10) Battery strength indicator
11) Levels sensitivity setting
12) Clear fish icon, fish alarm
13) Bottom contour: Show true changing of water bottom contour
14) User selectable meter or feet readings
15) Water Temperature Indicator
16) Waterproof design: Level-4 (spray-water-proof)
17) Memory: Built in memory stores sonar setting when the unit is turned off
18) W-Sensor could shut down when it is out of the water
19) W-Sensor battery life: Lasts for approximately 500hours of in-water use
20) Operational Temperature: -4F to 158F(-20C-70C)"

How does the sonar sensor work?

Sonar technology is based on sound waves. The system uses sonar to locate and define structure, composition, as well depth directly below the transducer of up to 45 degrees coverage. The transducer sends a sound wave signal and determines the distance by measuring the time between the transmission of the sound wave and when the sound wave is reflected off an object. It then uses the reflected signal to interpret the location, size, and composition of an object.

Features:

* Main Function: Fish Finder with Sonar sensor + 9 meter cable
* Display: 2" TN/Anti-UV LCD
* Backlighting: Green LED
* Sensor Beam Angle: 45 Degrees (200kHz)
* Depth range: 0.7m to 100m (2ft to 328ft)
* Sensor Beam Angle: 45 degrees
* Sonar Cable Length: 9 Meters (29.5 Feet)
* Operating Temperature: -20° C to 70° C (-4° F to 158° F)
* Power Sourec: 4 X AAA batteries (Not Included)
* Certification: CE
* Dimensions: L: 120 X W: 67 X D: 25 (mm)

Product Notes:

* Removable float
* Audible fish alarm
* Determines the location and depth of fish
* Selectable between meter or feet readings
* Get the approximate location of fish and the depth of water