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the other led is for bi-directional information between the meter and an optical probe that fits onto the meter for software enabled communication. The software allows reading of the meter and changes to the parameters of the meter.eg 1 rate or two rates. www.universalmeterservices.co.uk

The light on the left is for the optical probe,the light that flashes is the pulse which varies with load and has to pulse 1000 times for 1 kwh. regards www.universalmeterservices.co.uk