1Fish Finder Function: The portable fish detector detects and displays the depth of the water, the approximate location of the fish, the size of the fish, high and low weeds, sand and rocks at the bottom. 2Application scenario: Can be used for offshore fishing, kayaking fishing, ice fishing, lake fishing, ocean fishing, river fishing, etc. This will be one of your best fishing accessories. 3Depth Readout: Detectors have a range of 45 degree probe detection angle underwater. The detection of depth range is from 2ft(0.6m) to 328ft (100m) below fishing sonar transducer. The fishing sonar sensor is equipped with a 12 meter/39.4 feet cable and a detachable sensor float 4Powerful Functions: 5 modes sensitivity options; battery save mode; backlight mode; fish alarm; unit of measure. Normally fishing depth finder supports 4?5 hours continuous working with brand new batteries. Open battery save mode can be working even longer. 5Clear LCD Display: Comes with clear LCD display , which enables you to read the screen in bright sunlight or at night. It applies to lake, river, sea and other fishing environment.