AudioQuest - DragonFly Cobalt USB DAC/Headphone Amplifier with Apple Lightning to USB 3 Camera Kit - Music Direct
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Portable USB DAC for Audiophiles - Lavaudio DS400 – 1Mii
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Chord Mojo 2 Portable DAC Headphone Amplifier
Amazon.com: Fosi Audio Q4 Headphone Amplifier Mini Stereo DAC 24-Bit 192 KHz USB Optical Coaxial to RCA AUX Digital-to-Analog Audio Converter Adapter for Home Desktop Powered Active Speakers : Electronics
iFi Audio hip-dac2 Portable USB DAC and headphone amplifier at Crutchfield