This works great for determining the voltage and percent capacity of a 12v lead acid battery but that's it everything it does. Press the "Function" button once voltage is displayed, press it again, it will display 12 volt % charge, press it again and it will turn off. The "Settings" button does nothing - the included instructions must be for a different device. I plan to connect one to the wires on our 12v RV battery to monitor the remaining voltage and use the other to control my 12v generator start battery. Good deal for the price.
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