Specifications:
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

Package Content:
1 x Hearing Aid
1 x Carrying case
1 x Charger (110-240v.)
4 x Earplugs a
1 x User Instructional Brochure
1 x earphone

Note:
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 , make sure no air leakage.
Keep the ear plug clean
Remove the battery if you don't use it for long time.