Click the button to increase the count by 1.
Hold the button for one second to decrease the count by 1.
Hold the button for three seconds to reset the count.
Use the small wrench to loosen the hook head out.
Select the size you want and align the protrusion near the marked size with the slot in the handle connector.
Align the wrench with the groove on the hook head and tighten the hook head until you hear a click.
Electric crochet needle with glowing LED light, no worries even in the dark.