microphone to use with the DDJ-FLX4 controller

Hello:

I recently got the DDJ-FLX4 dj controller.  

When it comes to a microphone, I see it has a 1/4" connection for it.  

What type of microphone can you recommend I use so I can control the volume on the actual controller?  
By mistake, I got a microphone that is USB connection and can only be controlled via computer.  

This to DJ live online on several online platforms.  

Thanks in advanced for your suggestions and help.