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The 12V to 24V DC-DC Inverter is for charging the MARK 2 battery from a 12V power source.
It is not recommended to use this to power the MARK 2 air conditioner directly, as it may damage your power source once it isn't able to supply continuous and sufficient power.
There are two functional connectors, one is for 12V car cigarette lighter interface, and the other is for wiring directly to your 12V battery positive and negative electrodes.
Note: This product will be shipped seperately.