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: more than 50dB    
• Total harmonic distortion: less than 5% 
• Frequency range: 300Hz ~ 40000Hz    
• Input Noise: less than 30 dB    
• Operating voltage: 1.5V    
• Battery model LR44
• Current: less than 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 an 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 your ear, keep it tightly
• Next, turn this item on(O-N to N), adjust the volume until you hear clear sound
• SKU: LY069