Mini Ear Hearing

Super Mini Ear Hearing Aid Sound Amplifier Portable Ear Hearing Amplifier Volume Adjustable Hearing Aids for the Deaf Elder

Hearing aid
MaxSound Output: 130±5 dB
MaxSound Gain: 55±5 dB 
Harmonic Wave Distortion:≤5％(500Hz)
FrequencyRange: 300-4000 Hz
Input Noise:≤30 dB
Battery: AG13 Button batteries (included 1pcs)
Working Voltage: dc1.5V                      
Working Current:≤4mA             
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

Package included
1 x F-168 Hearing aid 
3 x Earplug (different sizes)
1 x User manual
1 x Box ( optional )

Note
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.