Purchased from Amazon in November 2024 and used for approximately one year. No longer needed as I'm reevaluating my desktop setup. * DAC is not built-in. A separate DAC is required. * Inputs: RCA single-ended and TRS balanced (two systems). * Headphone jacks: 6.35mm and 4.4mm (two). * The manual was not originally included. The manufacturer's policy seems to be to refer to the internet, but there's nothing particularly difficult about the connections or usage. * Box and all accessories are included.