Fish bottom profile reading: detect and display water depth, approximate position of fish, high and low bottom weeds, sand and stones. Adapt to a variety of fishing environments: it can be used for offshore fishing, boat fishing, ice fishing, lake fishing, sea fishing, etc. You can also use it on your mobile kayak at speeds below 5mph Depth reading: The range of the transducer detector is within the conical range of 45° underwater. Detection depth ranges from 3 feet (1 meter) below the sonar sensor to 328 feet (100 meters). Depth can be displayed in feet or meters. Transducer comes with 25ft cable and removable transducer float. Powerful small fish finder: 5 modes of sensitivity selection; power saving mode; backlight mode; fish and fish school alarm. Usually it supports 4-5 hours of continuous work with a brand new battery. Turn on power saving mode to work longer.