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With the RF45 Advanced Remote Sonar Sensor, you get even greater performance from your SmartCast wireless remote sonar: great depth capability, water surface temperature readings; longer in water use, programmable two-channel operation so you can fish with a buddy without crossing signals and even a flashing, internal light for night fishing that you can switch on or off. Green Sensor for use in the US and Canada only. For Use With: RF15, RF25, RF35 Will work as replacement sensor for the RF10, RF20 and RF30 but will not give temperature or extended depth performance on these models.