AudioQuest JitterBug FMJ (Full Metal Jacket) USB 2.0 Noise Filter uses Dual Discrete Noise-Dissipation Circuits to reduce the radio-frequency noise and resonances that are inherent to all digital electronics. The result is more spacious and compelling sound, music, dialog, etc. for a better audio experience.JitterBug FMJ features a shielded metal case to protect against external noise. An included USB plug is perfect for when JitterBug FMJ’s USB output port is unoccupied or when using a second JitterBug in parallel to the first, further prevent