DASHUHUWAIFF-010 Portable Fish Finder FishFinder With Sonar Sensor White LED Backlight Bottom contour and water temperature indicator User selectable depth range and zoom off/on; Users selectable meter or feet readings Big and small fish identification and fish depth indicator audible fish and depth alarm, depth alarm 3~99ft 10-level sensitivity setting; Depth reading from 2.0 to 240ft in 1/10th precision