MaxSound Output: 130±5 dB
MaxSound Gain: 55±5 dB
Harmonic Wave Distortion:≤5％(500Hz)
frequency range: 300-4000 Hz
Input Noise:≤30 dB
Battery: AG13 Button batteries (included 1pcs)
Working Voltage: dc1.5V
Color: As the picture shows
Item Size: 6.75 x 4.35 x 1.9cm
Package Size: 10 x 8 x 3.5cm
Net Weight: 7.5g
1 x F-168 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 a sudden increase in sound.
4.If you hear a howling, check the ear (silica gel) is appropriate and whether the size of the plug is tight, the appropriate choice of earplugs and plugged, make sure no air leakage.
5.Keep the earplug clean
6.Remove the battery if you don’t use it for a long time.