Looking for a certain piece of wireless microphone equipment, please help.

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And I'm not even sure what I'm looking for is available. Here is what I need:

I need a battery powered hub that can plug in to a microphone jack that can support at least two microphones via wireless. I'm not looking for anything expensive. I just want to use this for outside karaoke machine via evangelism. Can anyone point me in the right direction? Thanks!

 

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Something like this but battery powered. Does anyone know of anything?
https://www.ebay.com/itm/Pyle-Wirel...dio-Sound-Mixer-Receiver-2-Mics-/263293678491