Portable headphone amplifier with DAC transfer. Plug-and-plug usage as sound output for computers viac USB port, an effective upgrade to your computer's onboard sound card. Supporting sample rates up to 96 kHz/24 bit. Also with line input port, for portably amplifying any audio source via simple 3,5 mm connection. USB charging may be turned on/off via charging toggle switch, to improve compatibility with portable sources. For added convenience, you may also charge via USB while listening to it. Compact and unique metal body with sandblaster exterior for effective electromagnetic shielding. Built-in Li-poly battery holds 1400 mAh for up to 30 hours of continuous playback at normal volumes. - Dimensions: 97 x 56 x 13 mm - Weight: 100 g.