Zhao Yitian

Dear ZDoggy, Sorry for the problem. Can we know where do you live? You can contact our local distributor to get support directly. You can find their contact information here: https://xkeyair.com/where-to-buy/
Also you can send email to info@xkeyair.com, please take a photo of the black key internal structure, so that we can help to check whether there was any broken parts. We will send you the assembling instruction document too.