... audio intercom wireless audio intercom audio intercom system wireless video intercom CE,FCC,ROHS audio intercom OverviewTA-509 is a multi-2.4G digital wireless audio ... ,with a little amount of external components, such as audio amplifier,microphone, speakers, etc. Also adopt industrial-level ... capacity.4) With 12-bits digital audio signal serial input, DAC audio output port,the sampling rate is 8kbps ...