Fish Finder 4x Portable Fishfinder is a device that helps anglers to locate fish underwater. It comes with a Bullet Skimmer Transducer that uses sonar technology to detect fish and other objects in the water. The device has a 4' screen size, which provides a clear and easy-to-read display of fish and other underwater structures. The fish finder is portable, making it easy to carry and use in different locations such as lakes, rivers, and oceans.