For sale is my near mint ultrasone NAOS portable DAC/amp. It is functionally similar to the Dragonfly red but with a smaller package and a direct lightning or usb c connection to your phone. I have been only using it for a month or so and I am extremely satisfied with how lightweight and portable it is and how good it sounds. It is also MFi certified for apple devices. I can provide the original proof of purchase and all accessories. Price include shipping and PayPal. I am selling it because I am moving on to portable audio player and thus have no need of a portable DAC. But this is a great solution for those who want to stream music from iPhone or any other cell phone.