Photo 1 of Douk Audio 2 Channel Bluetooth Vacuum Tube Preamp, Hi-Fi Headphone Amp, USB DAC PC Sound Card, Wireless Receiver Audio Preamplifier with VU Meter, Optical, Coaxial, APTX, LDAC, DSD256, Remote Control

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Photo 1 of Douk Audio 2 Channel Bluetooth Vacuum Tube Preamp, Hi-Fi Headphone Amp, USB DAC PC Sound Card, Wireless Receiver Audio Preamplifier with VU Meter, Optical, Coaxial, APTX, LDAC, DSD256, Remote ControlPhoto 2 of Douk Audio 2 Channel Bluetooth Vacuum Tube Preamp, Hi-Fi Headphone Amp, USB DAC PC Sound Card, Wireless Receiver Audio Preamplifier with VU Meter, Optical, Coaxial, APTX, LDAC, DSD256, Remote ControlPhoto 3 of Douk Audio 2 Channel Bluetooth Vacuum Tube Preamp, Hi-Fi Headphone Amp, USB DAC PC Sound Card, Wireless Receiver Audio Preamplifier with VU Meter, Optical, Coaxial, APTX, LDAC, DSD256, Remote Control