The Automatic 140 Amp Dual Battery Isolator is all you need to charge Two Battery Systems. Voltage Sensitive Relay cuts in at 13.3 volts and cuts out at 12.8 volts to your primary battery is always charged and to your vehicle. It's like having two separate sources for each battery while only having one alternator Unlike other isolators on the market, the Automatic 140 Amp Dual Battery Isolator is IP67 Certified. This Protection rating means your isolator is safe for even for your off-road needs in dusty, wet and unexpected extreme weather environments. Great for extreme vibration applications as .This battery isolator suitable for 12V 140 Amp, Truck, SUV, RV, ATV, UTV, Boat and so on.Forget the diode relays and so-called "solid state" devices can you of almost 2 amps of output The Dual Battery Isolator is the unit designed with cutting edge programming to deliver performance - with sacrifice. This compact battery isolator was ultra-small to fit almost anywhere A under the hood to get to your dual batteries. your accessories to run from a separate battery while the engine is not working on your vehicle, and at the mean time holding your main battery charged and your vehicle always to work.Continuous Rating: DC 125AIntermittent Rating: DC 140A Consumption: 10mA (Standby)/ 330mA() / 0mA ()Terminal Studs: M6(1/4inch)colour: blackMaterial: ABSSize: 6.5cm x 6.5cm x 5cmPackage Contents:1 x 140 AMP Battery Isolator1 x Blue Ring Terminal4 x Screw1 x English manualOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.