A

Hello Andrej, Thank you for your inquiry.If you want to open the SOS function, follow these steps:Open the flashlight, switch to the first gear (the first grade, if you missed the first gear, please turn off the flashlight, reopened to the low grade),then you will see the lights flashed in wait about 10 seconds, then immediately press the switch and open half. (such as the current is 3 grade, after half press is 5 grade. 3 grade and 5 grade can be switched freely)5 grades:Low grade 5%- middle grade 40% - high grade 100%-- flash -SOS3 grades: Low grade 5%- middle grade 40% - high grade 100%