Features: 1.Dimensions fits Heavy Duty Modular Fuse Box Series (BF43x) and Battery Switch, matching mainstream products in market.? 2.Once your main starter battery is sufficiently charged, it will begin charging the second battery too. 3.Surface or panel mount options provides flexibility when installing. 4.No voltage drops comparing to battery isolator diodes (0.6V). 5.It has a solid glass fiber reinforced nylon shell. Specification: Features: _x000D_ Dimensions fits Heavy Duty Modular Fuse Box Series (BF43x) and Battery Switch, matching mainstream products in market. _x000D_ Once your main starter battery is sufficiently charged, it will begin charging the second battery too. _x000D_ A voltage sensitive relay (VSR) is the best way to ensure you can always get your dual-battery vehicle started. _x000D_ Surface or panel mount options provides flexibility when installing. _x000D_ No voltage drops comparing to battery isolator diodes (0.6V). _x000D_ It has a solid glass fiber reinforced nylon shell. _x000D_ _x000D_ _x000D_ Specifications: _x000D_ Condition: Brand New _x000D_ Material: Nylon _x000D_ Color: Black _x000D_ Size: 7 * 7 * 6cm / 2.8 * 2.8 * 2.4in _x000D_ Nominal Voltage: DC 12V _x000D_ Combine / Open Voltage: DC 13.3V / 12.8V _x000D_ Continuous Current Rating: 125A _x000D_ Intermittent Current Rating: 140A _x000D_ Power Consumption: 10mA (Standby) / 330mA (Engage) / 0mA (Storage Mode) _x000D_ Certification: CE IP67 _x000D_ Package Weight: Approx. 234g _x000D_ _x000D_ _x000D_ Functional Features: _x000D_ After the engine stalls, the left House battery discharges to the upper left load device, and the VSR disconnects when the battery voltage drops below 12.8V. The Start Battery on the right will not discharge to the device. When the battery on your left is not charging, it is used up. At least there is a little battery on the right that allows you to start the engine. _x000D_ _x000D_ _x000D_ Packing list: _x000D_ 1 * Voltage Sensitive Relay (VSR) _x000D_ 4 * Screws _x000D_ 1 * Manual PackageList: Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-DIMEANI official store