Looks like Krell gone Green, this was taken fom the web site.
LESS HEAT, LOWER ENERGY CONSUMPTION
A new green standby mode reduces standby power draw dramatically. Standby power draw for all Evolution e Series amplifiers has been reduced to 2W. As an example, the Evolution 402 power draw drops from 260W to 2W in the Evolution 402e - a reduction of 99% in energy draw and a huge drop in heat output. The power indicator ring now glows green to indicate the new energy efficient mode.