SONY Active Speaker / Neck Speaker SRS-XB20

Enhance your smartphone music with powerful bass reproduction for higher sound quality.

Equipped with two 42mm full-range speaker units, it achieves both high sound pressure and deep bass. It also features an EXTRA BASS button to boost low frequencies. Enjoy powerful bass that exceeds its size. Furthermore, it incorporates Sony's advanced high-quality sound technologies, such as the high-quality digital amplifier technology S-Master, DSEE which effectively compensates for the high-frequency range often lost in compressed audio sources, and ClearAudio+ which achieves recommended sound settings. Enjoy high-quality sound unique to Sony.

I purchased this a while ago but it has been stored away with almost no use.
There is no warranty card, but it has been tested and is confirmed to be in working order. The outer box and instruction manual are also missing.

We ask for your understanding that this is a used item before purchasing. m(_ _)m