With the Fish Hawk X4 Trolling System, you can easily maintain optimum lure speed and pinpoint desired water temperatures when trolling. The probe attaches to your downrigger and wirelessly transmits data from up to 300 ft. underwater to drastically increase your chances of catching fish. Displays both surface and probe temperatures and speeds. Fully sealed, leakproof probe electronics. Magnum-digit LCD. Water-sensitive auto on/off. Easy to use with any downrigger. Uses four AA batteries (not included). Includes power cable, transducer, mount and breakaway cannonball safety cable. Manufacturers one-year warranty. Made in USA. Cancer and Reproductive Harm- www.P65Warnings.ca.gov.