Feature: 1. Dual Battery Isolator Kit: Automatic 140 amp dual battery isolator is all you need to charge two battery systems, works like having two separate power sources. 2. Voltage Relay: Voltage sensitive relay (VSR) cuts in at 13.3 volts and cuts out at 12.8 volts to ensure your primary battery is always charged and ready to start your vehicle. 3. Function: The battery charge isolator enables your accessories to run from a separate battery while the engine is not running, and keeping your main battery charged. 4. Voltage Protection: When voltage is lower than 11V, disconnect to protect the main battery from overdischarge, and when it is above 17V, disconnect to protect the secondary battery from high voltage impact. 5. Heavy Duty: Heavy duty made, which is water resistant, shock resistant,, the battery connecting wire are made of copper, which have strong conductivity and less power loss. 6. Wide Application: Battery isolators are small enough to be installed anywhere and are ideal for most cars, RVs, trucks, tankers, SUVs, ships, boats, yachts. Specification: Item Type: Dual Battery Isolator KitMaterial: ABSWorking Voltage : 12V working Current : 140 AMP Red Line Length : Approx. 3m/9.84ftApplication:Applicable for most cars, RVs, trucks, tankers, SUVs, ships, boats, yachts. Package List: 1 x Battery Isolator1 x Red Battery Cable1 x Black Grounded Battery Wire2 x Fuse Holder4 x Black Heat Shrink Tube6 x Red Heat Shrink Tube10 x Strap4 x Safety Bar1 x Instruction Manual10 x Bolt10 x Double Sided Adhesive Cover10 x Copper Lug5 x Battery Isolator Accessory1 x Pack Of Gasket Bolt Fitting (6 pcs)2 x Terminal