Both sides of the wrist straps are equipped with strainers which makes the wrist straps tightness adjustable according to the size of your wrists.

Slide the wrist strap from bottom to top along the joy-con slide until it clicks, then CORN joycon straps will lock your controllers automatically.

The two buttons on switch strap correspond to SL and SR keys on JOYCON respectively. They can magnify SL/SR button for a better game feeling.