Before my SE arrived I wondered what that sticker was on the inside of the "charging socket lid" (as the Owners Manual calls it). It's a cryptic depiction of what the color of the LED to the left of the charging socket means. The black circle inside the colored circle indicates the LED is flashing. I haven't tried plugging in the charging handle without plugging in the charging cord to an AC outlet, so I haven't observed the LED flashing red. I'll let you guess what each of the pictograms mean (that way I can't be wrong--see page 223 in the Owners Manual for a description of the LED's meanings).
It would have been nice to have a second LED that illuminates the charging socket to make it easier to plug in the charging handle at night or in a dark garage. I'm planning to tape a skinny flashlight atop the handle. I wonder if any EVSE manufacturers are thoughtful enough to include a light in their charging handle?