The A5 Black is a portable headphone amplifier designed for audiophiles who value sound quality and mobility. With a compact design and a weight of just 168 grams, it is ideal for on-the-go use. The amplifier offers an impressive battery life of up to 13 hours, making it a reliable companion for long listening sessions. Notable features include a bass boost and a gain switch, allowing users to customize the sound and achieve an optimal listening experience. With a distortion factor of only 0.002 percent and a signal-to-noise ratio of 115 decibels, it guarantees clear and precise audio output. The A5 Black has a line-in connection and comes with a USB cable for easy connectivity to various audio sources. With its compact dimensions of 124 mm in length, 65.5 mm in width, and 14.5 mm in height, this headphone amplifier is both functional and user-friendly.