Max Sound Output: 130±5 dB
Max Sound Gain: 55±5 dB
Harmonic Wave Distortion:≤10％(1000Hz)
Frequency Range: 300-4500 Hz
Input Noise:≤30 dB
Working Voltage: dc1.5V
Color: As the picture shows
Net Weight: 9g
1 x Hearing aid
3 x Earplug (different sizes)
1 x User manual
1 x Box ( optional )
1.Adjust volume to the minimum before wearing.
2.Choose an earplug of slightly bigger size to avoid whistler.
3.Increase volume gradually to avoid sudden increase in sound.
4.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.
5.Keep the ear plug clean
6.Remove the battery if you don't use it for long time.