dual battery isolator kit enables your accessories to run from a separate battery while the engine is not running on your vehicle. In the meantime, it keeps your main battery charged and ensures your vehicle is always ready to go. We provide all the accessories needed for a complete installation. The VEVOR split charge relay kit fits perfectly into most cars, RVs, trucks, caravans, ships, boats, yachts, etc. Charge up optimally and stand up to the toughest challenges with VEVOR.