Attaching/Detaching the Joy-Con Strap Accessory
You can attach Joy-Con strap accessories to improve comfort and safety when you're playing with the Joy-Con controllers detached from the console.
How to attach
Match the + or − Button on the controller with the same symbol on the Joy-Con strap accessory, then slide the accessory along the rail.
Push up the slide lock on the bottom of the strap accessory to lock it in place after you attach it to the Joy-Con. Then, put on the wrist strap and push the button on the strap lock while adjusting the cord so that it doesn't slip from your hand.
How to detach
Push down on the slide lock to unlock the accessory, then grip the top of the accessory and slide it up.
How to remove a Joy-Con strap that has been attached upside down
Unlock the slide lock before removing the accessory.
You may damage the slide lock if you try to remove the accessory before unlocking it.