1.FISH FINDER: Fishfinder Designed for the liker in fishing. The unit can be used in the river, the lake, or the sea. It can help you to find out the fish and the depth of the water. Fish Finder Size: Approx. 12 7.5 2.5cm / 4.7 3.0 1.0in, Depth Range: Max: 100m / 3937.0in; Min: 0.7m / 27.6in, Measurement: Meters or Feet, Fish Detection: Fish Depth Scale, Fish Size Distinguish, Fish Alarm 2.SONAR BEAMS: Sonar technology is based on sound waves. The system uses sonar to locate and define structure, bottom contour and composition. Sensor Angle: 45 Degrees, Fish Finder Operating Temperature: -20 to 70 Degree Celsius, Power Source: 4 AAA Batteries (Not Included) 3.WITH LCD DISPLAY: All you need will clearly show on the display, you can quickly know the information. Continuous Usage Time: Up to 24 Hours, Cable Length: Approx. 10m / 393.7in, Display Size: 2inch TN/AntiUV LCD Display, Backlight: Green LED, Sonar Frequency: 200KHz 4.PACKAGE: Comes with a neck strap, easy to hang on the neck, convenient for you to use. Package list: 1 Fish Finder, 1 Manual, 1 Sonar Sensor, 1 Neck Strap, 1 Bolt, 1 Wing Nut, It is easy to use depth finder in boat fishing, ice fishing, shore fishing no matter in freshwater or in saltwater