The X1 from FiiO caters to music lovers who want to listen to high-resolution audio on the go. This compact lossless audio player features a Texas Instrument DAC (PCM5142) and Intersil amplifier. Plus, the output jack is switchable between headphone and line out to a dedicated amplifier. The headphone jack works with in-line remote controls on compatible headsets. Pro Quality DAC and Amp Utilizes Texas Instrument"s newest PCM5142 DAC, greatly surpassing the integrated DAC Chips in smartphones, tablets, and computers. The X1 also employs Intersil"s ISL28291 for its amplification circuit. Line Output X1 has enough power to drive headphones directly, or it can be set to provide line output instead. Switching between the two is easy via a menu section. Using line output, you can expand the X1 by bundling it with dedicated headphone amplifier such as E11K/A3 or E12. Complete Format Support The X1 support the major lossless music formats, APE, FLAC, WAV, WMA, ALAC, at up to 192kHz/24bits of master quality resolution. Plus MP3, AAC, OGG VORBIS. The X1 has a microSD slot that supports SDXC cards, currently up to 128GB, large enough to hold your entire music library. Lighter, Smaller, More Portable Made of light durable aluminum alloy, the X1 is compact and weighs a modest 3.75 ounces - perfect for portable use. Continuing FiiO"s scroll wheel and X-patter key layout, with operating system customized around the scroll wheel, users can quickly browse and play songs and add them to their favorites list. All New UI Theme Intuitive user interface custom designed and beautifully rendered on a full color LCD display. Interface color themes available in gold, silver, pink, orange, blue and green. Convenient short cut button brings instant control of your music library under your fingerprints.