Intelligent Parking Assistance System AM151600 / PZ606 Rear View Parking Sensor System. The box contains one camera, one monitor, four sensors, holesaw, cables, and directions. Ships free with USPS ground advantage. According to the directions you will need to drill four holes in your bumper and that is why it includes a holesaw. I have four of these available. One was missing the instructions and has been photocopied from the another box. These were originally purchased for some work trucks and we never installed them. Now with all new trucks that have backup cameras we have no need for these anymore. Purchase is for one but open to offers on all 4. Display is 3.5 inch digital TFT LCD screen.