The PU-304-KIT is a digital audio extender set designed to transmit SPDIF signals over CAT5e/6 cabling up to 150m. This unit supports both coaxial and optical digital audio inputs and outputs, handling stereo and multichannel formats including LPCM, DTS, Dolby Digital, and Dolby Digital Plus. Compatible with sample rates up to 96kHz, the system comprises transmitter (PU-304TX) and receiver (PU-304RX) units with dual transmission capability (1 coaxial and 1 optical channel). Power options include USB connection or supplied PSU adapter (5V/1.2A), making it suitable for installations where digital audio needs to be extended across longer distances without signal degradation.