The programmer has 3 operating modes, the modes are switched by a short push of a button and switched in a circle. You can tell which mode is currently selected by the blinking of the LED (1, 2 and 3, ...

Update 01/18/24: The appeals court has denied Apple’s motion (PDF) for a continuing stay on the sales ban, which means that the ban is back in effect beginning January 18 at 5 pm. ET. To continue ...