The NEW FiiO E12A special edition portable headphone amplifier adopts an upgraded high performance OP AMP combination. Designed around the MUSE02 by muses. The audiophile semiconductor division of New Japan Radio Co. Ltd, achieves unparalleled subjective and objective quality coupled with the LME49600 buffer to achieve <0.0003% distortion and increased S/N ration 115dB. The amplifier features intuitive controls that have been upgraded from previous models, the gain switch is now an easily accessible lever switch and a separate bass boost switch provides easy matching to different earphones and musical styles. The E12A unit can be charged via USB on your PC, or by using a USB plug adapter and features a light that pulsates to indicate speed of charging. The unit will automatically adjust to the correct charging current, the full charging time of the E12A is 3 hours. And buy this Fiio (Mont Blanc) E12A Portable Headphone Amplifier - IEM SPECIAL EDITION Now £129.00.