The 4 pin backup camera system is only need to connect the monitor power wire with car electronics system:
Red wire to car Positive/Live,
Black wire to GND,
Green/Blue wire to reversing gear Trigger+ (or No need to connect)
Simple to install easy to use
This rear view camera monitor system is support reversing used or permanently used

7 inch CAR TFT LCD Monitor DC 12V-24V

Display Size:7.0 Inch Large Screen
Resolution :800*480
System :PAL/NTSC Auto
Power requirement: DC 12V-24V
Consumption:6W
Video:2 channel video input;
V1/V2 switch,(V2 for reversing parking backup view priority)
Net Weight: Approx. 743g

18 IR LED Car Color Backup Reverse Camera

Image sensor:7070 mirror image without Grid Lines
TV system: PAL/NTSC
Lens:2.8mm(120 View wide angle )
Number of pixels:720(H)*586(V)
Horizontal Resolution: 480 TV Lines
Scan frequency:50Hz-60Hz
S/N Ratio:≥48dB(AGC OFF)
Minimum illumination:0 LUX
Backlight compensation: Auto
White Balance: Auto Tracing
Auto Gain Control: Automatic
Night vision: Yes
Video Output:1.0Vp-p.1.5ω.4Pin Connector
Synchronous System: International Synchronization
work Temperature:-20°C~+60°C
Power Requirement: DC 12V-24V
Weight: Approx 300g
Waterproof: IP 68

Package included:

1 x 4Pin 7" Rear view Monitor
1 x Bracket
1 x Remote control
1 x Monitor Power Video Harness Cable
1 x 4Pin 18 LED reversing Camera
1 x 4Pin 15M/49ft Cable