For Mercedes BenzPlease confirm whether it is a 4-pin connector on the rain sensor before purchasing. You can refer to the video in the product description to remove the plastic cover and find the rain sensor. 5V and 12V Output The input voltage is 12V, and the output voltages are 5V (USB cable) and 12V (DC 3.5mm cable). Comes with 6 types of output cablesDC 3.5mm Cable A (12V), DC 3.5mm Cable B (12V), RJ 11 Cable (12V), Micro USB Cable (5V), USB-C Cable (5V), and MINI USB Cable (5V). LED displayUnlike other brands model, the FitDVR adapter has an LED screen that can display current and voltage. Easy to installSpecial wiring harness connection, plug and play, easy to install. Will not void your vehicle's warranty. It will not affect the rain sensor. Professional and Support FitDVR independently produces and develops dash cam power adapters, provide various models of dash cam power adapter, cables, and wires. If you have any issues or requirements regarding dashc