Williams AV DWS PCS 2 400 Digi-Wave Personal Communication SystemThe transceiver in the system is DLT 400 from the Digi Wave system. It is a digital spread spectrum (DSS), simultaneous two way wireless listening system. Using a frequency hopping algorithm, it avoids interference and is a very secure method of communication. The Williams AV DWS PCS 2 400 Digi Wave Personal Communication System allows users to listen and talk to one another wirelessly in a variety of scenarios. Headset microphone MIC 144 is another