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.

KEY FEATURES:

• 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
• Made in U.S.A.