Some models of car may produce voltage interference after the engine is started. The power supply to the reversing light may not be a pure DC source, but instead has a pulse signal superimposed on it, which can be verified using an oscilloscope by detecting a similar square wave signal. Connecting the camera power line directly to the reversing light in such cases may cause severe interference or prevent the reversing image from displaying on the host monitor. Features - Color: Multicolor - Material: Plastic - Size: 17.00 x 1.50 x 1.50 cm / 6.68 x 0.59 x 0.59 in - Voltage: 12V - Installation: Black Wire: Negative; Red Wire: Reversing Light Positive; Blue Wire: Camera Positive - Car Camera Filter Cable is built with professional technology to ensure stable operation and long-term durability - Provides an easy solution for common camera issues - Designed for use with automotive rearview cameras to resolve problems such as black screen display - Constructed from plastic material for durability, strength, and extended service life - Offers stable performance, high reliability, simple design, and easy installation Package List 4 x Car Camera Filter Cable