Specifications:

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

Measurement: 46*27*16mm

Net Weight:12g

Special Function Key:  Rechargeable             

Package Content:

1 x Hearing Aid 

1 x Carrying case

1 x Charger (110-240v.)

4 x Earplugs

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 and plugged， make sure no air leakage.

Keep the ear plug clean

Remove the battery if you don't use it for long time.