AudioQuest DragonFly Red USB Stick DAC with 2-Pack JitterBug USB Data and Power Noise Filters JitterBug reduces the noise and ringing that plague both the data and power lines of USB ports JitterBug measurably reduces jitter and packet errors JitterBug improves dynamic contrast, warmth and resolution Dragonfly RED Compatible with Apple and Windows PCs, as well as Apple iOS (5 and newer; requires Apple Camera Adapter Kit) and Android (4.1 and newer; requires Made for Android adaptor) Dragonfly RED Delivers cleaner, clearer, more naturally detailed music to headphones, powered speakers, and complete audio systems