When comparing products for battery connection, charging, testing or status monitoring, consider Ballast Module LED Headlight Ballast Control Unit for W205 C CLASS 2015‑2018 A20 in the LED battery monitors collection. Listed product details include LED. The ballast module led headlight control details provide a product-specific reference point within the broader LED battery monitors selection. The listed application refers to W205 C CLASS 2015‑2018 A20; confirm the matching model, production year and mounting area where applicable. Review the complete listing carefully, particularly the dimensions, vehicle references and selected option.