iFI Audio iPurifier2 Type B I used this between my audio PC and DAC (Jeff Rowland Aeris). Among accessories of this type, the change in sound is quite noticeable (it removes muddiness and makes the sound clearer). I used it for almost two years and then replaced it with a new model, so I stored it for about three years. I have checked that it powers on for this listing. There are no noticeable scratches or stains on the exterior. Includes original box and accessories (type B-A converter). It is in good condition, but please refrain from purchasing if you are concerned about minor details. https://ifi-audio.jp/legacy/ipurifier2.pdf