Ear Hearing Aid Device Volume Adjustable Sound Voice Amplifier Enhancement Hear Clear for the Elder Deaf Hearing Aids Care S-139

Technical parameter：

* Max Out :130 plusmn 4dB

* Max Gain :48 plusmn 5dB

* Harmonic Dist:le 5%

* Frequency Range :450Hz ~ 3500Hz

* Equivalent Input Noise :le 32 dB

* Standard Battery:AG13 or A5 button cell

* Voltage:1.5V

* Current:le 3mA

Target user: People with moderate to severe hearing loss are available (average hearing loss not exceed 100dB). Package included: 1* Deaf-aid earphone 1* Zinc air hearing aid battery A675

3* silicone different size ear plugs (small, medium, big)

1* cleaning wax brush

1* English manual

1* FEIE warranty card

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.