USB audio decoding; can be used as external sound card</br>High-quality DAC and op-amp from Texas Instruments</br>Scroll wheel menu navigation</br>Coaxial digital input and dual-function line in/out port</br>Standard MINI USB Interface - connect with PC to make digital audio transfer possible and make battery charge possible</br></br>Product Description</br></br>The FiiO E17K is a portable headphone amplifier and digital to analog converter (DAC). The E17K has a built in rechargeable lithium battery and USB charger?? allowing you to charge on your PC or with a USB adapter. The E17K has fewer buttons on the front than that of its predecessor the E17. The FiiO E17K has a new multi-functional wheel that responds to both turns and clicks?? providing an intuitive agile control replacing many buttons from the older model.   The all-new E17K Utilises the SA 9027 USB