Feature: 1. Voltage Sensitive Relay: With auto and manual modes, VSR is connected at 13.3V and disconnected at 12.8V to ensure that your main battery is always charged and the vehicle starts. It is like each battery has two separate power sources and only one AC generator 2. Product Usage: Just like having two separate power sources, the dual battery isolator kit allows your accessories to run on separate battery when the engine is not running in the vehicle, while keeping the main battery charged, powering any ground or marine vehicle 3. Easy to Install: The VSR split charging relay kit comes with complete installation accessories and cables (battery cables, battery terminals, copper lugs, heat shrink tubing, cable ties), allowing users to easily install it independently onto vehicles, boats, and other equipment 4. Secure and Efficient: The dual battery isolator effectively manages and protects the power supply, preventing excessive discharge of the main battery and ensuring that the second battery is fully charged; Featuring IP68 water proof, dust proof, and shockproof structure, it can provide stable performance even in harsh environments 5. Wide Application: This dual battery isolator kit is widely applicable to trucks, RVs, ATVs, UTVs, SUVs, boats, yachts, etc. It is convenient and practical, and can meet your off road needs even in dusty, humid, and unexpected extreme weather conditions Specification: Item Type: Battery Isolator Kit Rated Voltage: DC12V Rated Current: 140AMP Water Proof Rating: IP68. Package List: 1 x Battery Isolator 1 x 7AWG Red Cable 2.0m 1 x 7AWG Red Cable 0.5m 2 x 7AWG Red Cable 0.25m 1 x 7AWG Black Cable 1.0m 2 x Fuse Holder 4 x 60A Fuses 6 x Crimping Terminals 10 x Adhesive Tie Mounts 19 x Mounting Screws 10 x Cable Ties 2 x M8 Battery Terminals 6 x Red Heat Shrink Tubing 1 x Black Heat Shrink Tubing 1 x User Manual