Function: 1. 2. Stable operation: ma voltage sensitive system to ensure that the main battery will provide high power do vehicle operation. 3. Wide applications: allows for wide application in motorhomes, 4x4, recreational vehicles, marine applications and so on, very practical. 4. Reliable use: This dual battery isolating relay can also withstand extreme weather conditions, shocks, and is also waterproof. 5. Easy to install: The set includes 4 screws and 1 clamp for added convenience. Specification: Item Type: Dual Battery Relay Product Material: ABS Kolor: black Nominal voltage: direct current 12 V Combine harvester voltage: DC 13,3 V Open circuit voltage: DC 12,8 V Continue with the birth value: DC 125A Intermittent rating: DC 140A Binding Post: M6 (1/4 in.) Waterproof rating: IP67 Application: Suitable do mounting on motorhomes, 4x4 vehicles, recreational and marine vehicles. How to use: The split charging relay ma red LED, which can indicate whether the main battery and starter battery should be discharged, and the additional battery can be charged separately. List of packages: 1 x Dual Battery Relay 4 x Screw 1 terminal 1 x English User Manual