This Bluetooth-enabled heading sensor contains a compass that detects your boat's heading and communicates it to your trolling motor to enable the Spot-Lock Jog feature, which lets you move your Spot-Lock location in 5 ft. increments in any direction. Two-Year Warranty *This product can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP), which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.*