Unopened, unused item. The packaging may have some damage due to home storage. Because the supported OS is old, it is unknown whether it will work with the current OS. Please note that even if it does not work outside of the supported OS, it will not be considered a defective product. The DreamBass / AP001E is a USB Hi-Fi audio portable device equipped with a vacuum tube design ※1 linear headphone amplifier. It comes with in-ear headphones that reproduce a rich sound with excellent low frequencies. The ultra-lightweight 4.5g design provides a comfortable fit even for long periods without stress. It features a high-quality design with a φ10mm driver. It uses an external type that is less susceptible to noise from within the PC, and by simply connecting it to a USB port, it elevates the audio output of a PC or laptop to the same class as Hi-Fi audio, producing clear sound faithful to the original sound. It uses the latest VIA VT1620A chip. It complies with USB Audio Class 1.0 and achieves high quality and low-noise audio quality with a maximum of 24Bit/96kHz for both playback and recording, THD-N: -80dB, and S/N ratio: 90dB. It is equipped with an independent 80Hz, +6dB Bass booster. In addition to the sound quality equivalent to Hi-Fi audio, it amplifies the bass, which tends to be lacking in headphones, to produce a more powerful sound. It is equipped with a flash blue LED. It beautifully illuminates the vacuum tube design during playback. Compatible with Windows 7, Vista, XP, 2000 / Mac / Linux OS. ※ Depending on the destination, either Sagawa Express, Yamato Transport, Japan Post, or various Mercari delivery services will be used (cannot be specified).