With both an 1/8” and USB input, you can use the U-SKIN either as a standalone amplifier or an integrated DAC/amp. Surrounded by a heavy duty yet lightweight aluminum alloy shell, the U-SKIN features a BL-5C battery capable of going strong for up to 40 hours per charge. Giving you enough power to get there and back, a range of listening options, and an overall package that barely puts a strain on your pocket, the TCG U-SKIN Portable DAC/Amp makes your music as mobile as you are.