Features 1、[Voltage Sensitive Relay] The smart voltage sensitive relay can automatically disconnect or connect auxiliary battery based on the voltage of the main battery. 2、[Auto Disconnection] When the input voltage is below 11V or above 17V, the circuit will automatically disconnect to guard the main battery from over discharge. 3、[2 Battery Charging] Allow for simultaneous charging two batteries from engine AC generator. When the engine starts and the main battery is full charged, the relay will start charging auxiliary battery. 4、[IP68 Water Proof] This smart battery isolator features IP68 rating, can withstand various weather conditions, suitable for travel without worrying about weather impact. 5、[Wide Application] The battery isolator is suitable for most RVs, cars, ATVs, UTVs, boats, and more. Can be installed in various locations easily. Specification Item Type: Dual Battery Isolator Material: Flame Retardant ABS Rated Voltage: DC12V Rated Current: 140AMP Water Proof Level: IP68 Package List 1 x Dual Battery Isolator 4 x Screws 1 x Cable Crimping Piece 1 x User Manual