For the record, Antonio at Maestro Zapper makes good products. We swap ideas and discuss potential improvements for future zappers.
The CCa has a control from 4 ma to 9 ma.
The CC1 and UZI have a fixed current control of about 8 ma.
I do not recommend the stabilized output but there is an optional jumper on the board to sellect it if you wish. I agree with Hulda Clark that it is not a good option. The only reason that we included it was because of the hype generated by one competitor.
If you use the Stabilized output jumper, it bypasses the Current Control.