Selling my R2R 1 dac. Bought new in January with TCXO upgrade. Everything is in perfect working order. It does have I2S via HDMI. Includes original box, packaging, and accessories (USB cable, power cord, jumpers). Added extras include perfect length acss cables to stack with NFB-1 or other Audio-gd amps and USB Blaster for updating. Comes from a smoke free home. Please ask if any questions.