○ audio prism ○ quiet line mkIII ○ Power (AC) noise filter ○ I purchased this used previously, but I am selling it because I have no use for it. It is a very effective filter, and I used it by plugging it into power strips like acoustic revive or indoor wall outlets. ○ Condition: Used item with general signs of use. * Please purchase only if you understand that this is a used item, as there may be scratches and other imperfections. ○ Recommended for those who want to enhance power strips, such as Oyaide, chikuma, Furtech, SAEC, KRIPTON, acoustic revive, KOJO, Pro cable, etc., or for those who want to reduce noise from wall outlets. ○ Please feel free to ask if you have any other questions.