WIFI Fish Finder is especially designed for amateur and professional fishermen alike,to find out the location of fish,depth and bottom contour of water.This WIFI fish finder can be used in ocean,river or lake and is fantastic for detecting schools of fish in any fresh water or salt water. This WIFI Fish Finder is based on Sonar technology, The WIFI transducer sends a sound wave signal ,the returned “echoes” are transmitted with WIFI technology to the IPHONE ,IPAD or other intelligent device ,then all the underwater information is displayed on the screen,including the water depth,water temperature,bottom contour,fish location and depth.