Reduce noise in your USB audio playback with the iFi AUDIO iPurifier3 USB Type-B Purifier. This device uses active noise cancellation to help reduce the noise from the power supply to enhance sound quality. It also employs iFi's REclock, REbalance, and REgenerate technology to minimize jitter and balance the USB data stream. It has a USB 3.1 Gen. 1 Type-B input and a USB Type-B 2.0 output.