The FiiO E07K Andes USB DAC Headphone Amplifier (Black) is the successor to the E7, with updated 24/96 USB DAC and a powerful headphone amp. With a host of new features including gain selection, hold key and independent bass and treble adjustments. It can bring you to experience the high quality acoustics playback. Lossless music format (96 KHz/24 Bit) contains details that ordinary CD (44.1 KHz/16 Bit) does not embody. On the basis of former E7, ANDES (E07K) added some functions which include right & left channel balance settings, bass and treble adjustment, line output, gain selection and hold key.