The X4 Probe uses a sonar signal to send water temperature, and trolling speed information at the downrigger ball to the boat.
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Detects speed changes of 1/10 MPH
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Probe uses a 70kHz sonar signal to send data
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Water-activated probe extends battery life
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Powered by four AA batteries
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Includes swivels to attach downrigger weight
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Epoxy potted electronics with double O-ring battery cap
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Compatible with legacy Model 840
