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iFi Hip-dac Portable Balanced DAC Headphone Amplifier for Android, iPhone with USB Input Only/Outputs: 3.5mm Unbalanced / 4.4mm Balanced (Unit only) : Electronics - Amazon.com
Amazon.com: iFi Audio OTG Cable/Adapter for USB C for Android Phones/Digital Audio Players (DAPs) / Digital Analog Converters (DACs) / Amps/Laptops : Electronics
Amazon.com: Portable USB DSD 192 KHz / 24bit DAC and Headphone Amplifier – DSD64 DSD128. Use with Smartphones/Digital Audio Players/Tablets/Laptops SD-DAC63057 : Electronics
Amazon.com: iFi Hip-dac Portable Balanced DAC Headphone Amplifier for Android, iPhone with USB Input Only/Outputs: 3.5mm Unbalanced / 4.4mm Balanced (Unit only) : Electronics