ricank portable fish finder, handheld wired fish depth finder ice kayak fishfinder shore boat fishing fish detector device with sonar sensor transducer and lcd display gear fish depth finder yellow ricank <b>features: </b><br> sonar beam: 200khz sonar beam with stable signal, effectively prevent signal disturbance.<br> fish alarm: allow you to instantly capture the fish without watching the float for a long time.<br> selectable sensitivity: easy to select the information of fish according to your different needs.<br> powerful functions: battery save mode, fish depth scale and fish size distinguish, parameter setting memory<br> underwater structure displays: deliver the information and environment of beneath the surface and help identify fish targets.<br> <br> <b>how to use the sonar sensor: </b><br> 1. toss the sensor and float into the water; <br> 2. attach the side-scan adapter to the boat hull using the mounting tabs; <br> 3. attach the sensor to a handle, lower the sensor into the water.<br><br> <b>attention: </b><br> 1. it will turn off automatically if the depth display reads "---" continuously for 5 minutes. <br> 2. the transmitter is waterproof, but the receiver (unit with screen) is not waterproof, so please do not submerge or spray the fish finder screen with water. <br> 3. it can not be used to detect bait fish(motionless) or fish that is smaller than 10cm. <br> 4. when use this fish finder on moving boat, please make sure the moving speed is slowly (lower than 5 mph). <br> 5. extremely cold weather will impact the performance of the product. it is suggested that you keep the unit in temperatures above 0 degrees during operation. <br> 6. strong waves, suspended matter and muddy water,will affect the performance.<br><br> <b>specification :</b><br> 1. measure units: meters / feet<br> 2. display: lcd <br> 3. backlighting: led<br> 4. depth range : max: 100m (328ft) ; min: 1m (3ft)<br> 5. sensor beam angle: 45 degrees<br> 6. operating temperature is from -20°c to 70°c (-4°f to 158°f)<br> 7. uses 4 x aaa batteries (not included)<br><br> <b>package included :</b><br> 1*fish finder set<br>