The X4 Probe gathers trolling speed and water temperature from the depths and uses a sonar signal to send that data back to the boat. Replacement probe for X2 and X4 System. Backwards compatible with Model 840.
Wireless sonar data transmission
Ultra-long battery life (4 AA batteries not included)
Detects speed changes of 1/10 MPH
Water activated auto on/off
Leak-proof double o-ring design
Includes breakaway double snap swivel and probe bumper