USB headphones DAC with dual headphones ports.

Includes USB Mini connection (with cable) and a USB-C OTG adaptor for use with a phone.

This will boost the volume and bass / treble of the output from your device, providing a higher quality digital to audio conversion. If you have decent wired headphones, a DAC is a must to get decent quality music out of your computer.

It can also act as an amplifier to an analog 3.5mm audio in jack.

This device is quite a few years old but has always been in its rubber case so the bodywork is in pretty good condition, and it has a screen protector on also.

The battery holds a charge, but really it does rely on the computer (or phone) for power. If completely dead it will take a few minutes to charge before it will turn on properly.