LUCKY FF1108-1 Portable Fish Finder, Depth Sonar Sounder Alarm Waterproof Fishfinder

Use the sonar sounder in normal ways
Fix the float position in advance.
Toss the sensor and float into the water.
 
For kayak fishing
1. Attach the Side-Scan Adapter to the boat hull using the mounting tabs; 
2. Break though the hull of a boat. Place the sonar sensor against the hull bottom 1 inch underwater. For ice fishing1. You should clear the snow on the ice layer. Make sure the surface is smooth enough. Put the transducer directly on ice layer to detect fish distribution in purpose of selecting a place to drill a hole
3.There should be no air between the sensor and the ice and no air between ice layer and the underwater either. Otherwise, the fishing sonar will not work properly. 
4. Cut a hole through the ice and put the sonar sensor directly in the water. Enjoy the fishing gear.  

Specification
1. 2inch TN/ANTI-UV LCD Display
2. Green LED Back lighting
3.1.81inch diameter transducer sensor
4. Detect Depth Range: 3ft~328.08ft under sensor
5. Sensor coverage range: 45 degrees beam angle in 200Khz
6. Sensor Operating Temperature: -14°F to 122°F(-10°C-50°C)