Standard Model features two-way communications between the chamber operator and occupants within the chamber. Full featured hard wire, two lock which have independent volume controls for the operator and separate on/off controls for each lock. The system is supplied w/ a noise canceling hand-held microphone for use by the operator. The microphone has automatic talk back speaker cutout which enhances communication quality by reducing background noise to the chamber occupants.
The Entertainment Model 2820-4003E has an amplifier to provide audio from any source, such as AM, FM, CD, TV, etc. The 2820-4003E has a separate on/off volume control for the entertainment channel and the entertainment monaural audio is interrupted when the hand-held microphone or push to talk switch is activated.