It’s a Sofirn design with 5 well spaced brightness levels. Hidden moon light accessible from off with a press and hold.
Then you have the 3 main levels low, med, high which are memorized. You press and hold to cycle through them.
Then you have the Turbo mode which is accessible from on or off with a double click. One more click goes back to where it was previously.
One click for on/off.
It’s a boost driver running the 50.2.
I have a link in my sig with pictures and more details. It’s my current favorite light.