The ZRS-AS-55B is a car media audio interface from Zetronix. It ensures high-quality audio playback on any audio system, as it features a level converter and line driver, giving it the capability of converting otherwise weaker audio signals into powerful output signals, without interference or distortion. Additionally, the ZRS-AS-55B is compatible with most audio device inputs, such as USB, CD, and MP3, and offers a 3.5mm AUX output (as well as RCA output) for connection to a car audio system’s external sound system. It also offers a power saving feature, built-in DAC for improved sound quality, and is suitable for both 12V and 24V vehicles.