What is this hole for in the controller?

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So I was changing the trigger springs in my controller this evening and I noticed a small hole in the back of the controller, which I can only assume to be a reset perhaps?
What is this hole actually for?
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What is the hole in the back of the controller for?
1 Answer. Show activity on this post. You're correct, according to Sony's documentation, it is the reset button.What is the plug on the ps4 controller for?
The PS4 Dual Shock controller's EXT port is there for you to plug in external devices. You can plug in headphones, additional trigger or thumb grips, a keyboard, or a charging station port. You can locate this port between the two thumbsticks, underneath the touchpad and PS logo.What are the holes on DualShock 4?
You mean this one? It's a reset button! You press this button with a paperclip or another small item to factory reset your controller. Do this if you ever run into an issue with your controller.PS4 controller inputs (part 2)
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Images: Erik Mclean, Dayvison de Oliveira Silva, Kaique Rocha, SHOCKPhoto by Szoka Sebastian