The Military Grade Portable Smartphone Fishfinding Sonar from FishHunter is so small, you can almost carry it in your pocket.  It’s shrunk down to fit inside a 8.5″ X 6.2″ X 3.0″ red rubber ball.  It has a rechargeable battery inside, and it comes with a charging stand.  You just float the military-grade sonar transducer in the water, and you’ll see all the fish swimming through its cone-shaped listening field on your smartphone’s screen.  The transducer connects to the smartphone, either Android or iPhone, via Bluetooth.  You’ll get maximum information from a minimal package.  It’s $179 at FishHunter.
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looks like an orange juicer to me.
angler’s little helper information. Thanks.