Trigger Mode: You need to switch the knob to Trigger mode, squeeze the handle to pre-set the staple gun, position the staple gun on the work surface, squeeze the trigger to set the staple.
Normal Mode: You have to switch the knob to Normal mode, place the staple gun on the work surface, at last squeeze the handle to set the staple.
Adjustable Staple Depth: There are two adjustable buttons----(+) and (-). Among the two , the (+) mode is for more power when driving staples into hard surfaces. (-) mode is for less power when driving staples into softer surfaces or in applications where the staple does not need to be driven flush.
