The Smart Start Dual Battery Isolator and Wiring Kit (SBI12KIT) is equipped with everything needed to install your Smart Start Dual Battery Isolator including the Smart Start itself. The easy-to-install kit is suited for the everyday DIYer since the SBI12KIT doesn't require any crimping or soldering. High-quality MTA 60 amp fuses and fuse holders with the corresponding ring terminals are already attached to the wires. The SBI12KIT prevents your secondary battery from draining your main battery. It works for harsh automotive or marine environments. And, it significantly extends your battery life, proving to be cost-effective and efficient.