S-139 Mini Hearing Aids Volume Adjustable Ear Listening Device Wireless Sound Amplifier For the Hearing Loss Elderly

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Products technical parameter :                                                                      
Maximum saturated sound pressure level (dB): ≤ 130dB + 4dB
Max Gain: 48+5dB
Equivalent input noise: ≤32dB
Total harmonic distortion: ≤ 5%
Frequency response range: 450Hz ~ 3500Hz
Rated power supply current: ≤3mA

Specification:
Product name: FEIE BTE invisible hearing aid
Size: 4.5cm*4.0cm*0.75cm
Net weight: 6g
Features: Wireless,small volume, low noise,
rotation ear hook.
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* green gift box
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.

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