The K5 Pro DAC and Headphone Amplifier from FiiO is a high-performance headphone amplifier and USB DAC that features coaxial, optical, and RCA line inputs, and 1/4" headphone and RCA line outputs. It can be used as a bridge for several music playback devices allowing your computer, speakers, and headphones to work together delivering an emotional experience with realistic detail from your music. The K5 Pro has a gain switch to adapt to low, medium, and high gain levels to work with a wide variety of headphones. The DAC supports decoding up to 768 kHz and also performs hardware native DSD decoding. You can take advantage of digital audio through the optical and coaxial inputs, which support up to 192 kHz signals for connecting various music players and digital interfaces.