Quick, sleek, portable technology. This is more than just a headphone amplifier. Support for all kinds of headphones, and inputs. Feel like plugging in your iPhone? Play and charge it from the USB port on the side. A USB “OTG” Socket on the back has iPurifier technology built in. Feel like playing a larger system? Pump out audio through Intelligent SPDIF Coaxial. You can properly listen to audio on the go.