Signstek FF-011 Wireless Fish Finder FishFinder With Round Sonar Sensor White LED Backlightbr Bottom contour and water temperature indicator Fish symbol and fish depth indicator br User selectable depth range and zoom onoff User selectable feet for meter reading br Depth reading from 20 to 100ft in 110th precision br 5-level sensitivity setting 125Khz sonar frequency br Battery in sonar can be replaced Audible fish and depth alarm 399ft