Abstract: A call box apparatus includes a controller unit, a radio frequency audio transceiver unit controlled by the controller unit, and a sensor assembly connected to the controller unit for controlling operation of the controller unit. A power supply assembly, an audio storage assembly, an output speaker unit, and an input microphone unit are connected to the controller unit. A housing assembly houses the controller unit, the radio frequency audio transceiver unit, the sensor assembly, the power supply assembly, the audio storage assembly, the output speaker unit, and the input microphone unit. The housing assembly includes a hinged door. The housing assembly includes a first housing portion which supports the door, and a second housing portion which supports the first housing portion. The door includes a door lock assembly. The sensor assembly includes an open-door sensor and a key-operated switch assembly. The power supply assembly includes a rechargeable battery.