The CircuitWerkes HC-3's automatic features make it ideal for a variety of telephone tasks such as listen lines, concert lines & remote broadcasting. The dry relay contacts provide an interface to virtually every type of external device including all types of cart machines. The remote inhibit input can be interfaced to prevent the HC-3 from picking up the line until you are ready. This feature can allow a cart machine or other device to re-cue before the coupler answers the line.

The HC-3's remote control features make it useful where the coupler must be mounted out of convenient reach of the personality or user. Additionally, the HC-3 may be easily controlled from more than one location at a time.

The HC-3 features a simple active hybrid circuit that provides some separation of incoming and outgoing telephone audio. The unit has a bridging, balanced audio input with a send level control and a low impedance, balanced, output.

For applications that require security, an optional combination lock is available. When installed, the caller must enter in a 4 digit, owner setable, password. Once the password is entered, a second internal DPDT relay latches for the remainder of the call. If the caller does not enter the correct code, the ComboLok will force the HC-3 to drop the call after three attempts. The comboLok option is priced at an affordable $99.00.

The HC-3 can be set to beep each time it picks up the line. When the optional ComboLok is installed the unit will beep twice when it first answers, then once more when the correct combination is entered.