Enjoy incredible audio on the go when you have the Astell&Kern ACRO CA1000 portable headphone amp. Giving you all you want from a high-performance amplifier, this portable gadget provides all the clear sound you could hope for. You'll love the 4 levels of gain and output up to 15 Vrms. It works with any headphone or IEM and provides multiple inputs and outputs for wide-ranging compatibility. Moreover, it has ESS ES9068AS Quad-DAC, giving you impressively balanced audio. And the 32 bit / 384kHz PCM and native DSD512 playback support makes this convenient. With the built-in battery, this carryable amp doesn't need an external power supply. Plus, the crossfeed support provides a natural acoustic experience when you use headphones. Use it with Bluetooth 5.0 and wireless 24-bit codecs like Qualcomm® aptX™ HD, LDAC.