The FiiO K5 is a compact desktop headphone amplifier designed to enhance audio quality for various devices. It supports multiple input options, including USB, optical, and line-in, making it versatile for connecting to computers, smartphones, and other audio sources. The K5 is known for its powerful output, capable of driving high-impedance headphones effectively. Equipped with a built-in DAC (Digital-to-Analog Converter), the FiiO K5 ensures clear and detailed sound reproduction. Its sleek design features a volume knob and indicator lights, providing an intuitive user experience. This amplifier is popular among audiophiles seeking improved sound performance without complex setups.