Super long stand by time Hearing aid:
Max Sound Output: 127±4 dB
Max Sound Gain:48dB ± 5dB
Harmonic Wave Distortion: ≤5%
Frequency Range: 450~3500hz
Input Noise: ≤32 dB
Battery: Lithium Battery
Working Voltage dc 3.7V
Working Current: ≤3mA
Net Weight 200g
color box size 15.3*96*38cm
Special Function Key: Rechargeable
1 x Hearing Aid
1 x Carrying case
1 x Charger (110-240v.)
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.