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You do realize there are two differnt versions right? The V1 had six descrete levels set by sense resistors and was avaialble in two max outputs. The second one used a microprocessor and you could change each level.
The second one was more expensive, but the first one was a simpler design that had no drain when off but if you got the 1000mA version it could theoretically overheat if you left it on max to long. There was a ~700mA version of the V1.
How does one tell which is which? By serial number? If so where is the break from one version to the next?