Instant purchase OK. There are no operational issues. Used for about six months. Included: Main unit Conversion connector The DT990 PRO's expansive soundstage and three-dimensional sound that accurately reproduces the distance of sounds are indispensable for professional engineers, professional musicians, and all audio enthusiasts. It boasts excellent resolution that accurately expresses each individual sound and high original sound reproduction power that outputs a balanced sound from low to high frequencies. The low frequencies are powerful, even for an open-back design, and it achieves a wide playback frequency range.