Each system comes complete, ready to install. No additional parts are not necessary to purchase. If the length of the vehicle is over 40', a signal amplifier is recommended (sold separately):
1 Monitor+ 1 Monitor clip+ 1 Monitor flat surface mount+ 1 Rechargeable battery for display
4-12 Heavy-duty sensors with batteries installed (number of sensors are based on the package purchased)+ 4-12 Locknuts+ 1 Locknut tool
1 Monitor antenna + 1 extended antenna
1 Cigarette lighter power adaptor
1 USB cord
1 Battery changing tool