If you're an active fisherman then this is a gadget you should definitely add to your tackle box. This is will become your best friend while you're out fishing. It can tell you the depth, temperature, and location of the fish just by placing this device on the water. The device uses sonar to gauge where the fish are. It can sense up to a depth of 100-120'. It communicates with your smartphone to give you the location of the fish. The battery life is pretty good especially if you like to fish for all day. It can last anywhere from 6-9 hours if used continuously or 500+ hours if it's in sleep mode.

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