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
Heavy-duty sensors with batteries installed (number of sensors are based on the package purchased) Lock-nuts 1 Lock-nut tool
1 Monitor antenna 1 extended antenna
1 Cigarette lighter power adapter
1 Battery changing tool