This is a self-made (or possibly someone else's) noise cleaner for DC power supplies. I don't know the specifications, but I have used it without any problems with an iFi Audio Zen Stream (12V) and a Wiim Pro (5V). Inside, it appears to use 12 each of Nichicon capacitors rated at 50V, 3300μF, 10μF, and 0.1μF. The DC cable connector is 5.5mm outer diameter and 2.1mm inner diameter. If there are any problems such as it not working or differing from the description, please contact me within 5 days of arrival. I will accept returns. ■Shipping Method Yu-Packet Plus ■Management Number V199 ■Search Keywords Petit Susie Petit Tank Noise Cleaner Noise Filter