Specification：
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.
Features:
Maximum sound output: 130 ± 5dB    
Sound gain: ≥ 50dB    
Total harmonic distortion: ≤ 5%   
Frequency range: 300Hz ~ 40000Hz    
Input Noise: ≤ 30 dB    
Operating voltage: 1.5V    
Battery model LR44
Current: ≤ 4mA
Weight: 74g
Instructions：    
The wire plug connected to the headset.Then earplug connector (hard) to the headset， earbuds (silica gel) to connect to the headphone connector pedestal  
The battery installation: Gently open the battery compartment cover， put a AG13/LR44 battery into the battery compartment in the right direction， then close the battery compartment .
Before you use this item ，you have to turn the O-N switch to O(off)，and turn the sound volume to minimum
Then put this item on you ear， keep it tightly
Next， turn this item on(O-N to N)， adjust the volume until you hear clear sound

sku：LY069