| EARPHONE ELEMENT TYPE | DYNAMIC |
| EARPHONE IDENTIFYING NUMBER | A20 MODEL NO. |
| EARPHONE IMPEDANCE RATING | 160.0 OHMS MINIMUM AND 320.0 OHMS MAXIMUM |
| EARPHONE QUANTITY | 2 |
| FREQUENCY RATING | 15.0 HERTZ MINIMUM AND 15.0 KILOHERTZ MAXIMUM |
| IMPEDANCE RATING | 220.0 OHMS MINIMUM AND 2200.0 OHMS MAXIMUM |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | BOSE A20 AVIATION HEADSET |
| MICROPHONE ELEMENT TYPE | ELECTRET CONDENSER |
| OPERATING CURRENT RATING | 25.0 MILLIAMPERES NOMINAL |
| SPECIAL FEATURES | BATTERY POWERED BY 2 X AA ALKALINE OR AIRCRAFT POWERED (10 TO 32 VDC) |