Which one works with xbr 70x850b?

Can’t be 100% sure but I did look up Remote compatibility and the lists indicate this standard Remote model should work with your TV model. I went to the Sony website and it showed a photo of this Remote as working with your TV but said it’s no longer available so didn’t list the specific Remote’s model name. It works with 2 of my Sony XBR OLEDs. I’d order it and return if it proves incompatible. Or you could contact the Seller with the specific compatibility question.

Is this remote infrared or radio frequency transmission?

It has both infrared and Bluetooth transmission.

will the mic control a roku?

There is Not a roku button on the remote

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OEM RMT-TX300U Remote Control Compatible with Sony Bravia TV Models: KDL-50W800C KDL-75W800C XBR-65X890C - Includes Netflix and YouTube Hotkeys

Product ID: 493927018

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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OEM RMT-TX300U Remote Control Compatible with Sony Bravia TV Models: KDL-50W800C KDL-75W800C XBR-65X890C - Includes Netflix and YouTube Hotkeys

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