Max Sound Output: 129dB ± 4dB
Max Sound Gain: 50dB ± 5dB
Harmonic Wave Distortion: 5%
Frequency Range: 450~3500 hz
Input Noise:30 Db
Battery: Lithium Battery
Working Voltage DC 3.7V
Working Current: 3 mA
Special Function Key: Rechargeable
1 x Hearing Aid
1 x Carrying case
1 x Charger (240v.)
4 x Earplugs
1 x User Instructional Brochure
1 x earphone
- Adjust volume to the minimum before wearing
- Choose an earplug of slightly bigger size to avoid whistler.
- Increase volume gradually to avoid sudden increase in sound.
- If you hear a howling, check the ear (silica gel) is appropriate and whether the size of plug is tight, the appropriate choice of earplugs and plugged, make sure no air leakage.
- Keep the ear plug clean?Remove the battery if you don’t use it for long time.