The Astell & Kern ACRO CA1000 Headphone Amplifier w/ Digital Audio Player is a portable headphone amp and media player offering hi-res audio support and advanced connection options. The ACRO CA1000 features 3.5mm 6.35mm Unbalanced 2.5mm and 4.4mm Balanced output jacks so no matter what headphone type you favour you can plugin and get straight to the music. A variety of digital and analogue inputs also feature so you can use the ACRO CA1000 as a portable Hi-Fi audio system. The CA1000 comes equipped with a large capacity battery offering 10 hours plus of playback negating the need for an external power supply adding to the superb and full sound reproduction offered by the Astell & Kern CA1000. TERATON ALPHA is one of Astell & Kerns proprietary technologies housed in the elegant silver shell that achieves studio-quality audio as the artist intended through efficient power management and amplification with minimal distortion. Bluetooth 5.0 also features resulting in faster transmission speeds greater range and a more stable wireless connection. Both LDAC and aptX HD is supported to provide audiophiles with the best wireless sound possible on the go.