Supplied as ready as in my prescribing ... another product. Fan chirps annoying, but the Luftströumgsgeräusche are lower than in the original fans (from Zyxel NSA325). Sending back is not worth at 2.70 purchase price ... who buys cheap, buys expensive :) I now have the speed runtergeregelt from the original fan with NEM Voltage Adapter ... works great and is resting in the NAS.