Features:
Automatically combines two batteries when charging and isolates the two batteries when not charging.
No voltage drops comparing to battery isolator diodes.
Robust glass fiber reinforced nylon enclosure, solid and durable.
Built-in LED indication (ON when voltage sensitive relay engages).
Surface or panel mount options provides flexibility when installing.
Optional storage mode allows zero power consumption when engine is off.

Specification:
Nominal Voltage: DC 12V
Combine Voltage: DC 13.3V
Open Voltage: DC 12.8V
Continuous Rating: DC 125A
Intermittent Rating: DC 140A
Power Consumption: 10mA (Standby), 330mA(Engage), 0mA (Storage)
Terminal Studs: M6(1/4")
Item Weight: 1726g / 60.88oz
Package Size: 21 * 21 * 10cm / 8.27 * 8.27 * 3.94in
Package Weight: 1770g / 62.43oz

Package List:
1 * VSR (Voltage Sensitive Relay) with mounting screws
1 * 6 meter red cable terminated at both ends
1 * 600mm black earth cable
2 * Positive marine battery terminals
1 * Negative marine battery terminal
2 * SC16-8 copper crimp lugs (for red cable)
1 * SC25-8 copper crimp lugs (for black cable)
2 * Red heat shrink
6 * 200mm cable ties
1 * Instruction manual