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Voltage Sensitive Switch 12/24V 500A upol 4A USB Port and Built-inThis Voltage Sensitive Switch (VSS) automatically senses connected battery bank voltages and provides optimal, efficient charging of the second bank. The VSS allows for the independent battery banks to be combined or isolated based on the presence of a charging source (such as an engine alternator or battery charger), while also offering remotely activated, high current, emergency parallel connection. Designed and constructed for longevity in the