Smart Dual Battery Is Protection Features： 1、Safety Protection: This battery isolator has overload protection to prevent circuit overload and battery damage. It also has short circuit protection to prevent dangerous short circuit. 2、Intelligent Management: Dual battery smart isolator can intelligently control the battery charging and discharging process to ensure maximum protection of the performance and life of both batteries, can also prevent excessive discharge of the battery on one side, thereby extending the life of the battery. 3、Multipurpose Application: The dual battery isolator is suitable for all kinds of vehicles, including ships, cars, trucks, RVS, ATVs, etc. Whether you're on the water or on land, it helps you effectively manage your battery and energy needs. 4、Easy to Install: The original vehicle line does not need to be changed when installing this isolator, the installation can be quickly completed, convenient and time saving, don't need too much tools or complicated steps. 5、Excellent Performance: This intelligent dual battery isolator possesses premium brass coil, quick start motor. And high starting power, reduce starting switch current. Specification： Item Type: Dual Battery Smart Isolator Material: Brass Working Current: 150A Applicable Battery: Sealed Battery/Lithium Iron Battery Peak Current: 300A (10 Seconds) Standby Consumption: Less than 30MA Mounting Screw: M4 Mounting Hole Distance: Approx. 13.4cm/0.5in Fitment: Suitable for Marine Car Truck RV ATV Package List： 1 x Dual Battery Smart Isolator 1 x Manual