Feature: 1. No Voltage Drop: Automatically combines two batteries when charging and isolates the two batteries when not charging. No voltage drops comparing to battery isolator diodes. 2. Lower Power Consumption: Optional storage mode allows zero power consumption when engine is off. 3. Voltage Sensitive Relay: Dual battery isolator ensure your primary battery is always charged and ready to start your vehicle. It's like having two separate power sources for each battery while only having one alternator. 4. Stable Performance: This dual battery isolator is also built to withstand extreme weather environments, vibration and waterproof. 5. Easy Installation: No alternator or ignition connection needed,You don't need any additional components to complete installation as everything is included in the kit, including leads, connectors, screws, and more. Specification: Item Type: Dual Battery Isolator Kit Material: Plastic+Metal Continuous Rating: DC 125A Intermittent Rating: DC 140A Power Consumption: 10mA (Standby), 330mA(Engage), 0mA (Storage) Terminal Studs: M6(1/4in) Red Cable Length: Approx. 600mm/23.6in, 300mm/11.8in Black Cable Lengt: Approx. 300mm/11.8in . Package List: 1 x Isolator1 x Cover4 x Screw3 x Terminal4 x Sheath2 x Manual3 x Cable