If faulty on arrival, the client will receive a whole refund instantly and no return from the miner is needed. Just after managing electric power-hungry S19 models For a long time, switching to the S21e XP Hyd 3U was like respiratory fresh air. I purchased a few from antminers23hyd.com https://johnnyrjdsh.suomiblog.com/where-to-buy-antminer-safely-55111528