Please note: 1) Please Note, It is a third-party product, compatible with Nintendo. 2)The system must be powered on. It is not possible to pair the product while the system is in sleep mode. 3) Up to eight wireless controllers can be paired to a Switch system 4) they do not have an infrared camera and NFC function 5) Cases and stickers made for original product will not work on these.? QA Q: What if this controller doesn't work as I expected. A: Linkstyle provide 24 months warranty, please send us an email through amazon if there is any quality problem. We will arrange you a refund or replacement. Q: What if the button disorder, crash, and connecting problem happen after long time use. A: This issue will not happens usually, but if these happen, you can use the slender object to press the reset hole at the back of the controller. Q: Does this stick to the switch. A: Yes. But this switch replacement is a little bit bigger than the originals which is more ergonomic. So you can not use a grip or case. Q: How to charge this controller? A:This controller can be charged while the main adapter is being charged by a dedicated adapter. Q: Does the vibration sound loud? A: No, it will not if you pair the controller rightly.