Earplug Digital Volume Hearing Aids Amplifier

Introduction:
Convenient wear
Low noise, low distortion;
For people with severe hearing loss;
Product use hearing assistive devices.
The scope of application of gas conduction hearing disorders.
Taboos otitis media or ear suppuration who are disabled.
Technical indicators:   
Maximum saturation sound pressure level of 129dB ± 4dB    
Full profile acoustic gain ≥ 38dB    
Frequency range of 450Hz ~ 3800Hz    
Power Supply Voltage 1.5V    
Battery model LR44
Features:
Maximum saturation sound pressure level: 129dB ± 4dB    
Full sound gain: ≥ 38dB    
Harmonic distortion: ≤ 15% f <1000Hz,  F> 1000Hz ≤ 10%    
Frequency Response: 450Hz ~ 3800Hz    
Equivalent Input Noise: ≤ 30 dB    
Operating voltage: 1.5V    
Working current: <8mA
Weight: 86g
NOTE:
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.    
Use for long periods of time, please remove the batteries to prevent battery rot erosion hearing aid components.    
Please regularly clean the ear plugs or ear molds in order to ensure the normal use of hearing aids.    
Avoid shock, drop, moisture, and high temperature.
Package included:
1 x Digital Tone Hearing Aid
2 x 1.5V Battery
4 x Earplug
2x Earplug Connector
1x User's Manual