what write speed is needed for 4k videos

[AC Question]

I have an LG g4 phone and the settings in the camera to record in 4k. I want to have a micro SD card that can write fast enough to record 4k

 

[nahoku]

Class 10, UHS 1, UHS 3. The gopro shoots 4k, so any card that can handle the gopro should work in you LG. HERE'S a good page to read.