1、Automatic Charging Relay: Help to avoid battery exhaustion, automatically combines two batteries and isolates them when charging, and uses two batteries separately when not charging. 2、DC 12V / 24V Automatic Detection: 12/24V input automatic range, VSR relay can automatically detect the voltage, and can detect the voltage of any battery pack. 3、Low Power Consumption: In the case of storage mode, zero power consumption can be achieved, energy waste is completely avoided, and the use is safer and more secure. 4、Premium Materials: Sturdy glass fiber reinforced nylon housing with multi directional opening design provides flexibility when installing, convenient for operating. 5、Built in LED Indicator Port: The VSR voltage sensitive relay is designed with an LED indicator port (excluding LED), which is used to indicate the VSR status when the VSR starts.