MicroBT Releases New Line of Whatsminer M50 Series
"MicroBT introduced three new models of the WhatsMiner M50 series: the air-cooled M50S++, the hydro-cooled M53S++, and the immersion cooled M56S++."
https://www.nobsbitcoin.com/microbt-releases-new-line-of-whatsminer-m50/