We are professional, in the field of vehicle camera for more than 14 years.
This is a single camera kit. It can be used for any kinds of large vehicles, such as buses, box trucks, pickup trucks, garbage trucks, flatbed trucks, dump trucks, street sweeper trucks, refrigerator trucks, motor homes, vans, skid steers, farm tractors, combines, cotton pickers, crop sprayers, bulldozers, snow plows, forklifts, excavators, heavy equipments,etc.
Camera can be mounted at the back/front/side of your vehicle.
Monitor also can be mounted on the roof of the cab.
Powered by vehicle power DC12-32V. Red wire to ACC 12-32V negative, and the black wire to positive (GND).
Trigger wires are for turning signal power to make the monitor display when turing or reversing, or kept blank to display all the time.