Specifications:

Pocket Hearing aid:
Max Sound Output:129±4 dB
Max Sound Gain: 58dB ± 5dB
Harmonic Wave Distortion: f<1000Hz≤15%,f>1000Hz≤10%
Frequency Range: 450~3500hz
Input Noise:≤30 dB
Battery:5# dry battery
Working Voltage dc1.5V
Working Current: ≤5mA
Net Weight :60g
Product size:6.1*4.1*1.6cm




Package included:

1 x Hearing Aid
3 x Earplug(Different Size)
1 x Instruction manual (English)
1 x Box

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.