The two-way button on the side can be used to lock and unlock the function of the knob. The knob is used to adjust the laser power, clockwise to increase the function, counterclockwise to decrease the power.
Tactical Metal Perst-4 Laser Red Green Blue IR Strobe Sight P4 Combined Device
The two-way button on the side can be used to lock and unlock the function of the knob. The knob is used to adjust the laser power, clockwise to increase the function, counterclockwise to decrease the power.