Anyone use this rechargable/wireless (inexpensive) depthfinder on their tube or 'toon?

Westfly Refugee

Steelhead
So fishing the other day, a friend had on his pontoon one of those inexpensive depthfinders with a cable running to a bobber/transducer. Seemed like a handy tool for $45 other than it uses 4 batteries.

I searched around for a rechargable model. This one is very similar to my friend's except it's both rechargeable AND wireless. Anyone have experience with this?

Venterior Portable Rechargeable Fish Finder Wireless Sonar Sensor Fishfinder Depth Locator with Fish Size, Water Temperature
 
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