Helpful Functions fish finder alarm depth finder portable fish finder portable fish finder handheld Fish Alarm The sonar sensor reflects the signal to the fish finder handheld when it detects fish and fish schools. Then the device alerts you and no worry about missing big fish any more. Battery Saving Mode The fishing depth finder is powered by 4xAAA batteries, and you finally get rid of troubles of USB charging all the time. Turning on the battery saving mode, the fish finder handheld can be working continuously for more than 5 hours. Back Light Mode LCD display allows data readout even in the sunshine. Meanwhile, when fishing at night, blue back light mode allows data readout in darkness. 5 Levels Sensitivity Sensitivity adjustment function helps getting accurate depth data no matter fishing in clear water or turbid. It also helps fishing transducer distinguish small fish and big fish by setting different sensitivity levels. For Ice Fishing, Kayak Fishing, Boat Fishing and Shore Fishing ice fishing kayak fishing fish finder shore fishing boat fishing ICE FISHING Clear the snow on the ice layer. Make sure the surface is smooth enough. Put the fish finder portable directly on ice layer to detect fish distribution in purpose of selecting a place to drill a hole. There should be no air between the sensor and the ice and no air between ice layer and the underwater either. Otherwise, the portable fish finder will not work properly. Cut a hole through the ice and put the fishing sonar sensor directly in the water. Enjoy the fishing gear KAYAK FISHING Attach the side-scan adapter to the boat hull using the mounting tabs. Break though the hull of a boat. Place the fishing sonar sensor against the hull bottom 1 inch underwater. The moving speed of kayak should be below 5mph. PIER / SHORE FISHING Fixed the removable float on the transducer cable. Cast the fishing transducer into water as far as you can. You can cast the fishing sonar transducer either by your hand or by the fishing pole. BOAT FISHING Portable fish finder is helpful in boat fishing which displays water and fish depth accurately. It is also a good fishing accessory for canoe, float tube, jet ski, kayak and so on. Use LUCKY fish finder in a correct way. Switch Measurement Unit Press "Enter" button for 5 seconds, then you can freely switch the measurement unit by ft/m. Correct Working Mode There are two working mode for the kayak fish finder, normal mode and demo mode. Press the power bottom for 3 seconds, the fish finder will be in demo mode automatically. In order to get accurate detection data, please restart the device and get into normal mode instead. Try the fish finder in wide water area. You can't use it in swimming pool because the transducer doesn't work in small space. The sonar technology is based on sound pulse. The transducer send a sound pulse signal and determines distance by measuring the time between the transmission of the sound pulse when the sound pulse is reflected off an object. If the water space is small, the time is too short to measure the data you concerned