Features: The car rearview rectifier can efficiently provide 12V for DC power supply for your rearview camera, helping to solve the problem of "ring screen" or "black screen" when using the rearview camera. Professional camera straightening machine with high performance and stable performance. The reversing rectifier (or filter-box) can solve the interference problems such as the ripple splash-screen of the reversing camera. The relay filter rectifier is made of high-quality precision components, plastic for shell, solid structure, waterproof design, good wear resistance, high quality and long service life. Prevent distortion from your car rear view camera going away, and make the video picture in the rear view camera more clearly. Effective solution to reversing the situation or reversing black water ripples, wiring simple, German for cars and model year old car essential artifact. Specifications: Material:Plastic Size: Approx.4.8x2.6cm/1.88x1.02inch Color:Black Package Includes: 1 x Power Relay Capacitor Filter Rectifier note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.