FiiO E10K USB DAC Headphone Amplifier.
The E10K USB DAC Headphone Amplifier from Fiio is designed to improve your laptop's audio output quality via its PCM5102 DAC chip and is capable of handling PCM files in up to 24-bit, 96 kHz resolution. It features a selectable bass boost and low-pass filter, both with circuitry optimized for a low noise floor when engaged, allowing you to customize the sound of your audio to your tastes.
The unit connects to your laptop via its Micro USB connection, which also provides it with power. It offers a variety of connections, including a front-panel 1/8" headphone jack, a rear-panel 1/8" line output, and a rear-panel coaxial digital output, which allows you to send your digital audio to another destination.