In Stock. 45 Day Lowest Price - 100% Satisfaction Guarantee. The most widely recognized and trusted name in AC power conditioning is proud to introduce the PL-PRO D II power conditioner, featuring Furman's revolutionary SMP technology. Furman's Series Mode Protection (SMP) circuit also features our exclusive Linear Filter Technology (LiFT). Together, these technologies comprise what is, without question, the world's most advanced and comprehensive transient voltage surge suppressor.