C-109 Behind-The-Ear Super Power BTE Hearing Aids
A-31 Elderly Super Invisible Mini Rechargeable CIC Digital Invisible Hearing Aid
| Product model | A-31 |
| Working voltage | 3.7V |
| Battery capacity | 25mAh |
| Endurance | About 25 hours |
| Maximum OSPL90 | ≤118dB + 3dB |
| High frequency average OSPL90 | 110dB±4dB |
| high-frequency average | 36dB±5dB |
| Total harmonic distortion | ≤7% + 3% |
| Frequency Response Range | 450Hz - 3000Hz |
| Equivalent input noise level | ≤29dB + 3dB |
| Product size | 22.×14.9×12.8 |
| Weight | 3.0 |
