from the manual:
The Charge Wizard! Operation
While the built-in Charge Wizard! automatically determines which operating mode is best suited to recharge or maintain optimum
battery condition, the Wizard Mode Button allows for manual override and has indicator light(s) to indicate the mode of operation.
NOTE: The Green LED on the left refers to the Charge Wizard!
- the Red LED on the right was for the Charge Sentinel (supplied on
converters built prior to year 2000)