Photo 1 of Douk Audio U3 PRO HiFi Mini Class A Headphone Amplifier – High-Power Desktop Amp for 18-600? Headphones, 1500mW Output, 3.5mm & 6.35mm Jacks, DC 5V

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Photo 1 of Douk Audio U3 PRO HiFi Mini Class A Headphone Amplifier – High-Power Desktop Amp for 18-600? Headphones, 1500mW Output, 3.5mm & 6.35mm Jacks, DC 5VPhoto 2 of Douk Audio U3 PRO HiFi Mini Class A Headphone Amplifier – High-Power Desktop Amp for 18-600? Headphones, 1500mW Output, 3.5mm & 6.35mm Jacks, DC 5VPhoto 3 of Douk Audio U3 PRO HiFi Mini Class A Headphone Amplifier – High-Power Desktop Amp for 18-600? Headphones, 1500mW Output, 3.5mm & 6.35mm Jacks, DC 5V