Fangrui Product Details [professional Quality] - The Relay Filter Rectifier Is Made Of High Precision Components With Plastic Shell, Sturdy Construction, Waterproof Design, Good Abrasion Resistance, High Quality For A Long Service Life [easy To Use] - Easy To Install, No Modification Required. Just Read The Wire Configuration - Red Wire Input: Reverse Light Positive Pole / Black Wire Input: Reverse Light Negative Pole / Red Wire Output: Camera Positive Pole / Black Wire Output: Camera Negative Pole [good Performance] - The Car Rear View Rectifier Can Effectively Supply 12v Dc Stabilized Power To The Rear View Camera, Helping To Solve The Cyclowarp Screen Or Black Screen Problem When Using A Rear Reversing Camera . Professional Camera Rectifier With High Characteristic And Stable Performance [check Compatibility First] - The 12v Power Relay Filter Rectifier Can Be Used To Supply 12v Dc Stabilized Power To The Rear View Camera. Car Rectifier For Germany / American Car Series. Size: 4.8 X 2.6 X 1.5cm / 1.9 X 1.0 X 0.6inchEasy To Clean And Maintain