AiLi Battery Monitor DC 300V 100A Voltmeter Ammeter Voltage Amp Meter Gauge with Hall Effect Sensor Transformer

How longa are the wires and cables?

I just received this and there is no install instructions for automotive car install. Do the black and red leads connect to 12 volts source voltage?

Does this version Have ability to reset ah and kwh?

will I need two being I’m using a battery isolator for my two batteries for my audio system?