This small asynchronous DAC does exactly what it is intended to do. Allow your computer to play high resolution music - with excellent precision and clarity. I purchased this new in 2012 and used it for about a year, then as you all know, I felt the need to upgrade. So this has not been used since 2013. I updated the firmware to the latest version in 2015. It works perfectly, definitely a plug and play DAC. It is in near new condition. I will pay for shipping in the United States and PayPal fees. Specifications 400mA USB-powered 24bit/96kHz device using asynchronous* (master mode) transfer protocol. It runs native Audio Class 1.1 drivers for instant plug 'n' play.. Full-scale output is 2.25Vrms. There's a 100Ω Z out, S/N ratio of 115dB (DC to 30kHz) or 120dB A-weighted and 200MΩ isolation between full-size USB input and RCA outputs. Measures 5.6 x 2.3 x 0.875". Sample-rate confirmation for 32, 44.1, 48, 88.2 and 96K via a cluster of small LEDs on the input side.