... terminal power supply, two-way simultaneous transmission of control signals and data (and can be extended to transmit high- ... 1Khz/16bit audio data transmission, voice delay <1ms;Access to power supply: standard 220V ± 22V power supply, output voltage: 9V ... %;Three-in-one network port (including power supply, control, communication, data exchange, high-definition VGA signal (optional)).Digital student ...