Nope I hadnt noticed them.
However I have just found out that their units r avalon clones and are very power hungry...1250w overclocked!
Antminers use 400w overclocked.
stock clock 2 antminers @185 avg. each(including 4 fans) and 20 usb sitcks u1 uses 763 watt on a Corsair Ax860(230volt outlet)