| EARPHONE CONTROLLING AGENCY | DAVID CLARK CO. |
| EARPHONE ELEMENT TYPE | DYNAMIC |
| EARPHONE IDENTIFYING NUMBER | -642-4 MODEL NO. |
| EARPHONE IMPEDANCE RATING | 150.0 OHMS MINIMUM AND 1.0 KILOHMS MAXIMUM |
| EARPHONE MOUNTING METHOD | SUSPENDED ON ADJUSTABLE HEADBAND |
| EARPHONE QUANTITY | 2 |
| CONNECTOR CONTROLLING AGENCY | DAVID CLARK CO. |
| CONNECTOR IDENTIFYING NUMBER | 18253G-05 PART NO. |
| CONNECTOR NAME | JACK |
| CONNECTOR TO JUNCTION CORD LENGTH | 5.000 FEET |
| CONTROLLING AGENCY | DAVID CLARK CO. |
| FREQUENCY RATING | 125.0 HERTZ MINIMUM AND 8.0 KILOHERTZ MAXIMUM |
| IDENTIFYING NUMBER | M-1/DC MODEL NO. |
| MICROPHONE ELEMENT TYPE | DYNAMIC |
| MICROPHONE MOUNTING FACILITY | BOOM ATTACHED TO HEADBAND |