Now with Humminbird's Advanced Remote Sonar Sensor (RSS), the Smartcast Wrist Mount Fish Finder gives you the ultimate fishfinding performance. Greyscale technology for more bottom & structure details Water surface temperature The Smartcast Wrist Mount Fish Finder is Illuminated for night fishing 500 hours of in-water use Enhanced power output for even better performance Programmable A/B channels let you fish with a friend without crossing signals The Smartcast Wrist Mount Fish Finder has an impressive 30m radius remote operating depth Lightweight, compact, & totally waterproof display One touch menu navigation easily controls fish ID, depth range, fish alarm, & sensitivity With the Smartcast Wrist Mount Fish Finder you get the benefits of a traditional fishfinder, plus unmatched freedom & mobility to fish wherever you want, even places other fishfinders can't go. Whether you're casting from the bank or boat, with Smart Cast there are absolutely no limits on where you'll find fish. Use the remote. Sonar Sensor to preview an area before you fish. Just cast it out, then reel it in for an accurate picture of what's below.