1Wide Fitment: Dual battery smart isolator suitable for a wide variety of vehicles, such as, cars, RVs, trucks, tankers, SUVs, ships, small boats, yachts. 2Practical Function: Dual battery isolation kit allows your accessories to run from a separate battery while keeping your main battery charged and ready to start your vehicle when you need it. 3Maximum Durability: Our 140 Amp dual battery isolator is safe to use even when your off road vehicle is in a dusty, wet or unexpected extreme weather environment, and can also stably operate in vibration applications as well. 4Voltage Protection: Our dual battery isolator features a voltage sensitive chip, cuts in at 13.3V and cuts out at 12.8V, to ensuring your primary battery is always ready for your vehicle to run. 5Equipped with LED Indicator: There are LED indicators on the sensitive relay panel. When the dual battery isolator is turned on, the LED indicator lights up, and when it is turned off, the relay indicator light is off, which is convenient to observe the charging status. 6Convenient Installation: Voltage sensitive relay package contains a complete set of installation accessories, with the help of the installation instructions, you can easily complete the installation, no alternator or ignition connection is needed.