Forget the conventional diode relays and so-called "solid state" devices that may compromise nearly 2 amps of output power. The Dual Battery Isolator is engineered with state-of-the-art programming to deliver exceptional performance - with NO compromise. This compact battery isolator is designed to be ultra-small (2.6 inch x 2.6 inch x 2 inch) to fit almost anywhere, making it an ideal choice to be placed under the hood, close to your dual batteries. The Automatic 140 Amp Dual Battery Isolator is all you need to charge two battery systems. The Voltage Sensitive Relay activates at 13.3 volts and deactivates at 12.8 volts, ensuring your primary battery is consistently charged and ready to start your vehicle. It functions as though you have two independent power sources for each battery while utilizing just one alternator. Unlike other isolators available in the market, the Automatic 140 Amp Dual Battery Isolator is IP65 Certified. This International Protection rating ensures that your isolator is safe for use in off-road conditions, handling dusty, wet, and unexpectedly extreme weather environments. It��s also excellent for applications subjected to severe vibrations. 12V 140 Amp Dual Battery Smart Isolator with a Sensitive Relay is specially designed for off-road vehicles, boats, and recreational vehicles. It enables your accessories to operate from a separate battery while the engine is off, simultaneously keeping your main battery charged and your vehicle ready for action. Product name: smart battery isolator Product voltage: 12V Product features: high capacity, capable of switching a 140 ampere current, flame-retardant casing, waterproof design Coil power: 3.4W Contact capacity: 1a 140A 14VDC Contact resistance: less than or equal to 50m Insulation resistance: greater than or equal to 1,000M Ambient temperature: -40~+125 Service life: electrical 1*1000000 (times) Size: 68x68x53mm Material: ABS Colour: Black Package Contents: 1 * Smart Battery Isolator 4 * Screws 1 * Terminal Only the above package content is included, other products are not part of the package. Note: The color of the item in the picture may differ slightly from the actual item due to lighting and different displays. The allowed measurement error is +/- 1-3cm.