FiiO E12A Mont Blanc IEM Special Edition Portable Headphone Amp, Titanium Designed around the MUSES02 by MUSES, the audiophile semiconductor division of New Japan Radio Co Ltd, coupled with an LME49600 buffer Achieves &lt;0.0003% distortion and an increased signal-to-noise ratio of 115dB 22V high voltage supply with 850mW maximum output power for larger headphones Charging indicator blinks according to how long charge will take depending on what it is plugged into Charges fully via laptop in 3 hours