The AU680B is a wireless audio extender based on UHF (Ultra High Frequency) technology. It features both 3.5mm and RCA L/R stereo interfaces, enabling CD-quality audio transmission over distances of up to 100 meters. The system supports one-to-multiple transmission, with a maximum of 50 receivers connectable to a single transmitter. Up to 10 device pairs can operate simultaneously in the same space without interference.

The transmitter is equipped with a frequency display for easy channel monitoring, while the receiver includes a volume control knob for convenient audio adjustment, making the AU680B a flexible and user-friendly solution for wireless audio distribution.