| Model | E80 |
| Impedance | 8mm 120Ω±15% ShΩ±10% |
| Sensitivity | 102±3dB |
| Resonance Freq. (Fo) | 350Hz±20% |
| Frequency respond | Fo~20KHz |
| Distortion | Max: 2% @ 1KHz |
| Rated Input Power | 3mW |
| Maximum Input Power | 10mW |
| Level difference average | 3dB @ 1KHz |
| Headphone length | 400±10 mm + 800±10 mm |
| Operation TEMP | -10℃ ~ +55℃ |
| Storage TEMP | -20℃ ~ +65℃ |
| External Appearance | Should not exist any obstacle to be harmful to Normal operation: not any remarkable damages， cracks， rust and distortion， etc. |
