Features: A voltage sensitive relay (VSR) is the best way to ensure you can for always get your dual-battery vehicle started. The VSR connects and disconnects the auxiliary battery and the starter battery according to the current charge level while the engine is running, when the starter battery reaches 13.2 volts, the VSR will start after 15 seconds and the LED light will illuminate. This means that both batteries are connected and the system is running. Once the vehicle system is turned off, the two batteries will be disconnected when 12.8 volts is reached after another 15 seconds, allowing your main battery to restart safely. Voltage: 12V. Maximum operating current: 50A. for Peak current: 70A. Specifications: Material:Metal Current consumption - charging: 150MA Current Consumption - Standby: 1.5MA Insertion voltage: 13.2V Cut off voltage: 12.8V Breakaway Delay: 15 seconds for Protection level: water resistant for protection Size:Approx.84x42x37mm/3.31x1.65x1.46in Net Weight:113g Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Dual Battery Isolator