The sliding power switch has a built-in color indicator for each position:

Orange: ON

Blue: OFF

Slide the power switch to the blue OFF position.

The LED will turn purple and pulse to show the iron is powering down.

Leave the soldering iron connected until the indicator ring turns blue, indicating it's now safe to touch the soldering iron tip.

Remember: The LED only functions when the soldering iron is connected to a power source—so use caution when handling an unplugged iron if you don't know how hot it is.