Official programming instruction. The model is actually K-106.

On/Off battery discharge protection:
Turn on the light.
Soft tap the switch 3 times to toggle between protection on or off. If the light blink once, it is off. If the light blink twice, it is on.

Programming mode:
Turn on the light.
Soft tap the switch 5 times or more.
The light will blink once, indicating programming mode 1.
3 sec later, the light will go through the following cycle:
    1. low to high. Once reaches the highest, the light will blink once.
    2. strobe, from 1Hz to 15Hz.
    3. SOS.
Then it will repeat the above cycle.
To set mode 1, turn off the light at the desired setting for more than 1 sec.
To continue to set mode 2, turn on the light again within 4 sec. The light will blink twice, indicating programming mode 2.
If the light is off for more than 5 sec, it will exit programming mode.
Repeat for mode 3 (the light will blink 3 times when you enter mode 3).