I'm currently using a 256gb without issue. Which is higher than what was recommended (of course that was like 2015). I've heard tale of 500+ working just fine but I can't speak to that. I've used the 256gb for sometime though and haven't had problem. its a SanDisk Extreme Plus 256GB SDXC CardSorry to beat a dead horse but what's the largest size microSD these can take? I have a 128gb in mine but would like to get a bigger card