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Amplifiers by FiiO. Details:KA1 USB Dongle is a tiny headphones amplifier it comes equipped with a 3.5mm single-ended and a 4.4mm balanced 2 headphone outputs. It equipped with high-performance flagship DAC can support up to 32bit/768kHz and DSD512. You could use the KA1 USB DAC to connect with your smartphoneAndroid or iOS/PCWindows or Mac/other deviceslike player/tablets. And it has mini body you could take it whatever at any time it means you could get HiFi audio at any wherever. It is very portable and convenient.