Who can tell me the difference between a NanoPI R5S and a NanoPI R5S-LTS??

Had an R5S, then ripped the SD card holder off taking the board out with a card in the slot (shame on me - but it still works fine) and the R5S-LTS that I ordered because I was ... well, anal (There - I said it!)

Anyway - there is an IR sensor and a "Mask" button, but little info on the Wiki about this change and no wiki for the R5S-LTS

ALSO - the banner ad on your sight shows R5S at $59 USD but links to the R5S-LTS at $60 USD ---

Thanks
Tony