AudioQuest - Jitterbug USB Filter + AudioQuest DragonTail USB 2.0 Extender This bundle includes (1) AudioQuest JitterBug USB DAC and (1) DragonTail USB 2.0 Extender Reduces the noise and ringing from data and power lines of USB ports Measurably reduces jitter and packet errors Improves dynamic contrast, warmth and resolution Signal Conductors Controlled for Digital Audio Directionality